Consolidating all the MCU threads are fine, I've thought about it plenty of times and kind of did it with the Sony/Amazing Spiderman franchise but the problem is any news that are posted during a movie release will get buried and ignored. Loads of people flock the thread once a movie comes out and honestly, even I can't keep up with it.
Plus, for those who wants to stay tuned with other Marvel news or discuss it but doesn't want to get spoiled, it's easier to avoid the movie thread than the whole MCU thread but those might be in the minority.
If you guys are consolidating the threads, it should be easy enough to contact any mod to do it. They can probably start with Phase 2 (IM3 and forward).
I am not sure if there is a way but it would be cool if several active members are able to edit the first post and title though so that it can be updated when a movie comes out or a big news is announced or there is a big reveal.