I think the MCU will hold up fine do to the fact that it was all original and not remakes. Now once Disney decides to start rebooting those characters we will see how well they hold up to the originals.The interesting test is to see if the stuff of today is worst I think will be in the future when we look back and see how much of the current stuff is still popular and whether much of it has a timeless appeal to it much like TOS.Classic Star Wars,Back to the Future etc. Will people 20 years for now still be huge fans of the MCU for example. Will all these Disney remakes hold up or in the end will the old cartoons of Ariel and Jungle Book etc will go back to being the definitive versions. I think we already know which Ghostbusters people will still love in 20 years and chances are even if this new one is good it still will be kind of forgotten and the 1984 version will still be the best.
Heck nobody has even been able to do a modern Superman movie that matches the 78 version. I think this is a issue when you have era dominated by remakes and reboots. They are almost doomed even if they are good to always live in the shadow of the classic versions that came before them. In this regard I do think the MCU does stand a chance to still be loved because it has basically defined the Marvel brand.
Jason
Never watched Dr.Who but I have always been a fan of Star Wars and Star Trek. I think Star Wars is in a much better place than it was after the prequals. I love the Mandalorian series and liked all the Disney movies except TLJ. Star Trek on other hand hasn't been interesting to me since the end of DS9 and Nemesis. With Enterprise,the Abrams movies and Discovery they seemed to just want to rehash the past. I was so glad that the Picard series came along to move the story forward. Haven't had a chance to watch it much but it's on the bucket list.
Having said all that, to each his/her own. Like what you like and who cares what others think? This is just my opinion.