That argument doesn't make sense at all, and people keep skipping over the reasons why Sony wouldn't moneyhat a MvC4.
Lots of time and money to spend on negociating the IPs (that Disney would decide, as well as having a say over development), wasting money on an exclusivity when they're already the fighting game console by default this gen, all three studios having different priorities (Sony got already its big fighting IP and big Marvel IP exclusive games, Capcom can't develop games like they did before and have yet to make SFV a commercial success, Disney making tons more by going multiplatform and mobile without crossovers), and various other lesser reasons.
Disney has tons more money to make by going multi-plat, and yet we live in a world where one of their biggest mascots is having one its biggest new video games be exclusive to the PS4.
Sony has not been in the business of really moneyhatting 3rd party exclusives that were already in development. Its not been something they've done this generation. Their exclusives from 2nd or 3rd party development efforts were always done as a 1st party funded effort, just like SFV or Bloodborne. I understand there are people who refuse to believe that SFV wasn't funded by Sony, but it was and thats the reason we got it how we did. Outside of that, several games, particularly from Japan, have only been exclusive specifically because those publishers know their games won't really sell on other platforms- its happenstance & coincidence, not nefarious design.
You need to not ask whether or not Sony would Moneyhat this game, and instead ask whether or not Sony would pay to have this game's development funded. If anything, MvC4 is a better project to fund than SFV, since it comes with half a cast that appeals to a far larger demo than what SF normally does, who also have giant blockbuster movies released 2 or 3 times a year.