If I'm being honest, I hope whatever this project winds up being isn't anything that's been mentioned here. I feel like the hypothetical "End of the Line"/"Old Man Blahblahblah" concept is about as played out currently as pitting superheroes against zombie versions of other heroes. Ideally it'll be an in-universe, current continuity project, hopefully featuring characters who don't get a lot of attention and aren't part of (nearly) every "new" Avengers line-up we get.