I dunno, Hyrule Warriors has been working pretty well, I wonder if they could take on any other franchises
Then looks at the crossover between Shin Megami Tensei and Fire Emblem (Tokyo Mirage Sessions #FE, say that one out loud, just rolls of the tongue, doesn't it... ) Before they actually showed us a proper trailer for that game, I was expecting a straight-up crossover game like Project X Zone, universes collide and what-not. But it really does look like its own universe, it doesn't look like something that needs to be retconned by the fans because "He can't be both here and there, they wouldn't be working together", instead it looks it built from the ground-up with sprinkles of spiritual characters and franchise lure and connections peppered about, otherwise it has its own characters, world and storyline. It's not your average crossover and it doesn't look like a crossover, but I'm still invested in the idea. It's a crossover of the concepts and ideas found between the 2 franchise rather than throwing in everything, maybe even the kitchen sink.
In that Nintendo Direct the other day, they called it a 'Brand New IP', at this point it could of fooled me.