RDJ was going to come back, he confirmed there was a 4th movie being made:
Everyone is looking to lose weight these days, but most people miss the one key to just how easy it really is...
honknews.com
Then it was shelved, then rumor about a TV show surfaced, then it got canned again.
There is a possibility that IM didn't die, based on how the story is about to develop thanks to Loki but I guess we'll never know until is official.
It was also rumored that Black Widow was alive after they brought everyone back, though she was most likely lost in space but, due to the ScarJo's litigation, I don't know how that's going to play out. She was also supposed to be filming a Tower of Terror based movie for Disney but that was put on 'hiatus' for the same reason.
When I said closure, I didn't mean to say that Loki should be killed off but he could have somewhat of a final chapter (hate to bring Capt. America to the table but....) like the way CE exited the franchise. Granted, I came to find out that this was not the way Capt America was portrayed in the comics but more rather a fanfiction-esque way to say goodbye, I wasn't all too sad about how they chose to end his story line.
Loki could go back and rebuild Asgard or something like that.
Maybe it's just me dying to see TH doing something else, stepping a side of Disney or if he chooses to remain in the same company, to have more versatility in his roles alas Johnny Depp (If there was an actor I'd hope TH could emulate, career wise, that'd be him)
what I'd love to see is Loki catching a glimpse (in one of the multiverses) of Tom as Tom in a suit but sitting reading Stan Lee's biography and saying to him "nice suit" with Tom looking rather perplexed as this Asgardian Prince and other Marvel characters walk through/disappear....... I'll shut up now
I CANNOT UNSEE THIS! AND I NOW NEED THIS TO HAPPEN!
That could be a possibility though it'll be weird...I don't know, I'm also very attached to TH as Loki