Regarding the filing dates, remember that in 2002 Democrats were able to replace Robert Torricelli well after the filing date in a senate race. That was decided by the NJ Supreme Court so its not a slam dunk but the RNC could, in theory, petition to have someone added even after the date.
https://en.wikipedia.org/wiki/United_States_Senate_election_in_New_Jersey,_2002
It's less those deadlines (and we've passed a ton of them, so I don't think the RNC could get on all 50), but by RNC rules (which can't be changed now), we're past the point where Trump can be ousted without his consent. Unless he voluntarily leaves the party or dies, they're stuck with him. To dump him is to publicly put their fingers on the scale and it would destroy their party.
The house is on fire anyway, but they're hoping to salvage the basement at least.
And bow to the crooked media!? He is doubling down.
He hates Manafort. He's always liked Corey more, and I guarantee a bunch of Trump's decisions recently (Pence, teleprompters, etc...) are coming after long arguments with Manafort. And that's a bad thing for Trump because...
Supposedly it was the Trump kids that wanted Lewandowski out because he had bad ideas. Did they just disappear after that? (I guess Ivaka decided to go on vacation). Don't they have a meeting every day where the first question is, "how many offices do we have in Florida?" And the answer is always, "1". So Manafort is letting this happen? Or Trump is forbidding new offices open because he thinks Twitter is better? What is happening to all the fundraising money?
There is so much that doesn't add up about this campaign, and man is it going to be juicy when people start spilling the beans.
...Trump only likes yes men! His campaign adds up perfectly in that light. Under no circumstances has Trump ever made a mistake. Ever. Anyone who says that (who isn't his own kids) would be fired or ignored on the spot. They don't talk about Florida offices in front of Trump because it would be implying that they don't have enough. That would be a mistake, and Trump doesn't make mistakes.
He basically believes he's a Chuck Norris meme, come to life. No one in this campaign has any real authority. It's like how some control freak owners of businesses (like restaurants) will hire managers to run the place when they're out, but they don't give them hiring/firing/product/etc... power, so all the employees know that they're a manager in name only. Trump's staff is like that. There's the only actual manager, Trump (and family). Then there are a lot of people who are called managers but don't actually have any authority to make decisions with resources. Then you have the worker bees who have no instruction because Trump doesn't care to give them instructions and the managers don't have the power to do so either.
This campaign is off the rails. I'd wager most of the staff at this point is just cashing a check (and drinking heavily since they'll only work again if they can hide this job from a background check). No one on board actually believes in "Make America Great Again" because the only people that do believe that stuff are fringe nutjobs who can't hold down jobs. Katrina Pierson made it the furthest up the chain (as a nutjob herself), and now even she's showing why you can't hire these people.
When a bad organization crashes, there are usually difficulties in getting the truth out of it if people in the org were loyal to its goals. That's not going to be the case here; we'll find a shit ton of people looking to spill the beans on November 9th as fast as possible because there's just no way anyone working for Trump could possibly care about his message enough to safeguard it against prying eyes.