Personally, I want another Iron Man movie starring RDJ, an Ironheart movie, a movie starring the kid in Tennessee that helped Iron Man in Iron Man, III AND a movie starring Pepper Pots and her an Tony's now teenaged daughter as a pair of Ironwomen.

In the comics, Tony Stark didn't die defeating Thanos. He was just shunted to a parallel dimension. He eventually found his way back. I see no reason why, after the Dr. Doom thing plays out, that an aged and bitter sand outraged Tony Stark (angered that Bruce Banner, Dr. Strange, Reed Richards, Hank Pym, etc., didn't even try to bring him back) comes back with his liquid metal Superior Iron Man suit (modeled after the symbiotes like Venom and Carnage) comes back, pretends to re the team but is secretly plotting their destruction.

Frankly I've been dying for RDJ to tackle the Superior iron Man storyline, and that's just one of many organic ways they could do it.

Besides, having Iron Man, War Machine, Iron Patriot, Patrioteer, Ironheart and other heroes in suits works out fine in animated form. I don't see why it wouldn't work in the MCU.

Heck, there are basically already 2 Thors in the MCU (4 in the animated series with Beta Ray Bill and Thunder strike in addition to Thor Odinson and Jane Foster).

And there are multiple hulks in the MCU already too.

And it seems like they come up with a new half-assed super soldier in every 3rd movie!