I'd have liked it more if the base roster was replaced by modern Marvel's variants of the main cast (IronHeart rather than classic Tony, Cho Hulk rather than Banner Hulk, Miles rather than Peter, etc), and they left the premium costumes from DLC to either be season pass material, pre-order bonuses, or just in-game freebies (similar to Injustice 2's premium costumes.)
These variant promo-comic covers could have been used to announce that classic style characters were coming to the game.
Capcom side could have benefit from such an obvious distinction too. Like Chun could have been in her Alpha clothes, or something designed by a Marvel artist. Ryu could have taken the "Hot Ryu" as his default. Arthur could have had a Maximo inspired look, Spencer could have started as the Bionic Commando style look, etc. It would have been a nice way to make the returning cast feel like more than MvC3 CopyPasta.
It seems really weird that they pretend to think "People might not remember the X-men!" but they're not really trying to show anything that's fresh or unique for those already in game. I'd buy the line, if the cast was recent 2010s Marvel comics, Netflix series, and TV interpretations, alongside the desired X-men and F4 concepts that were based on 90's nostalgia. But the divide doesn't seem to be anyway near as pronounced, so far.