Trial happens. Either to show they mean business, or he tries something to escape, I figure the president's aide gets killed. He's a brand new character versus the other 4 established ones. Screams Red Shirt to me.
Harold reveals himself in some fashion, but in a way that isn't a "total reveal". Unsure if he or anyone reveals that it's not a simple "mass surveillance, but actually the worlds first AI", which would be it's own shitstorm.
Reese and Hersch somehow are able to track down that location (cause hey, that place looks like a library or large old building, shouldn't be too hard to single out possible locations). Large gunfight occurs, where I bet most if not all of Vigilance is killed, but I imagine the Senator is too. I have a feeling Control lives, but perhaps Hersch doesn't. Finch and John should make it out (cause hey, they're the show), and I'm unsure on what happens to Greer.
It looks like the cops raid Finch's library, which makes me feel it might happen near the end of the story, post-rescue. That leads me to believe that Harold is somehow exposed in all of this. But I assume that Fusco might help move the cops in the wrong direction.
Root's wearing a labcoat in a whiteroom, and Shaw's with her, so I'm assuming they're together @ Samaritan. I've just had this feeling for a long time that Root isn't making it beyond this season. That she's been the Machine's arms and feet, up until it upgrades itself, which leads me into:
Super theory time: i've had multiple thoughts on how Decima and Vigilance are connected. Some of these theories are not compatible with each other.
1. The Machine has been behind Vigilance all along. A secret army to ferret out Decima and the government. Things that it, post-becoming free, decided were threats to human life. Vigilance has always had this odd ability to know things first, move undetected, and other things that should have popped up.
2. Decima has been behind Vigilance all along. Information broker could also explain how Vigilance knows things first/faster. Also, before being Captured, Greer seemingly knew they were coming ("It's already too late, Senator" or something like that.) That combined with how odd Decima is (people killing themselves, not really wanting control over Samaritan). They've used Vigilance to both remove The Machine, but also to ensure that the government will want to use it (Samaritan), by sacrificing Greer, along with the other 4 people, to a terrorist attack (the Kangaroo Court), all because they had turned off The Machine (because of public influence). Selling the idea of a 3rd party system that isn't held to the same standard as the Government is.
3. Harold's involved with Vigilance. Tired of the fight, upset at his losses because of Government corruption, Harold created a contingency plan that can both reveal the machine's existence (since it's beyond being able to be turned off), and stop any competitors in the AI-Creating business. My least likely to happen thought.
2a & 3a: Ingram is behind Decima and/or Vigilance, because hey, half the cast is "presumed dead", why not pull the trick on us and have a presumed dead person really be alive.
Only people I know should make it to season 4 are Reese and Fusco.
My 95% survival is Finch
Root or Shaw won't make it out, with Root being the most likely choice.
Greer is 50/50
Collier is 25%, mostly based on the possibility of him being connected to Decima or the Machine, if this was all some sort of long con.
Control is at 75%
Hersch at 35%
The Senator is at 15%
The other guy, just mark him for death.
Rest of Vigilance is Dead or in custody.
In all of this, I still hold out hope that Elias plays a small part, perhaps in saving Finch. But the storyline currently has no ties to a "small timer" like Elias (on the scale of where it is now, yep, Small Timer)
Lastly, trying to decide, just what the hell is Root and the servers doing? What does it mean?
She said something about "slowing down their adversaries." Maybe she thinks it'll slow down Samaritan's reaction time, enough that the government won't want it. But, I'm going with a different thought:
The Machine doesn't tell Root everything.
I believe the Machine tells the hackers how to set it up, where it can infiltrate the rest of those servers, wipe out Samaritan, and use the new power of the servers and the improved functions of Samaritan, to upgrade itself. That all of this, Decima and Vigilance, was it's long con, to improve itself, using people as chess pieces to get to this point.
The word "Decima" is the name for one of the Roman "sisters of Fate". It's greek version is called Lachesis:
"Lachesis was the apportioner, deciding how much time for life was to be allowed for each person or being. She measured the thread of life with her rod. She is also said to choose a person's destiny after a thread was measured."
Choosing how much time left in life? Choosing a person's destiny? Sounds a bit like how the machine works. It could see those things, but with upgraded potential, and the Decima army behind it, can now "choose" instead of just observe.
Which makes me think, that the next season, at least going forward, is that The Machine is the big bad. Just one that still has that line of code that continues to try and save irrelevant people.
Jonah always said this wasn't a show that could just 'keep" going. I figure we have 1 or 2 more seasons left.
Added thoughts going forward, if this is the case: Finch seems to be found out, but still needs manpower to fight The Machine. Good way to bring in Elias and his group.