Dunno if I like this "flaming hammer" thing for Titans
Of course you don't know if you like it - we know absolutely nothing about it
As for people expecting 2 Raids...of the base game only had one, I don't see an expansion having two. I also don't think HoW had a Raid that was canceled or whatever - the "Arena" had been datamined for a long time and just assumed to be the next Raid.
I think Comet will be ok in terms of amount of content. The true test, however, will be the quality of said content. Adding a new Raid on the level of Vault of Glass would automatically validate asking price for me. Another Crota's End, in terms of mechanical creativity and encounter design, would be a disappointment.
Will they manage to add a decent amount of Exotics? 3-4 new Exotic weapons like these expansions has been truly lackluster. I'd like to see at least twice that, hopefully more. Bring us a Void Sniper, an Arc Rocket Launcher, lots of gaps need to be filled.
HoW is definitely on the right track with Story missions. They spruced up the whole go, send ghost, kill wave, defend ghost, kill wave that literally made up the entire base game. They can go further. I'd like to see longer, more complex missions and set pieces. I mean these guys made freakin Halo.
The new Strike is good, but could be better. I'd like to see new Strikes offer some objective other than kill sponge. Kill on a timer to prevent an explosion or protect a target or capture some dudes. Whatever really, just change it up a bit.
Where I feel they haven't messed up yet is armor. Each expansion has had their own unique and interesting exotic armor pieces. I trust they'll follow suit, give Warlocks some cool space magic boots
Another note: Etheric Light ascends stuff to "year 1" level. This language makes it sound like they'll be left behind. I really, really hope Exotics don't. I don't think they'll add enough new Exotics to make up for the devastating loss which leaving the current stuff would entail. Please please don't leave Exotics at Year 1. Legendaries I understand. Fatebringer will have done more than enough and I'll let him rest when the time comes.
Finally systems. In game LFG, private matches. Boom. GOAT.