Sf5 was rushed out for the pro scene.
It was a commercial flop but its not like it took a bunch of money to make. And they've probably made a ton on the whole dlc/seasons/content since then.
MvCi looks to be a flop commercially as well, but its an amazing game, gameplay wise and that's something that everyone agree's on.
But no Xmen and a terrible art style plus the back lash from SF5..... yeah rip.
Simply put if MvCi would have used a different art style or at least had 1 or 2 xmen the whole vibe of the game would be different.
But again Dlc and the pro scene will always keep those games relevant.
Side note: marvel is actually selling well in japan...which is unusual.