It could be fun to see.
I'm not sure it would happen because of bussiness reasons ( resources, platinum may not be a huge seller to capcom, platinum is made of disgruntled ex capcom employees).
But on the flip side, the crossover would benefit both franchises so from a bussiness standpoint it makes sense.
Back when DmC was first announced, people wanted Team Ninja to do a DMC game. That felt unlikely because Team Ninja would be helping out a rival more than themselves. So a crossover felt more likely.