I would encourage crossover events so long as it's related to the company or the franchise. I would love a Dissidia-based thing where the event trials or fates would be against the heroes themselves. Go up against the original Warrior of Light? Yes please

So FF/KH crossovers? absolutely, I'm all for it. But NO anime crossovers, please. Especially considering the top candidates currently in the industry just would not fit the game (imo) and they've already been done to death in other game crossovers. Which might be part of the fear of doing crossovers altogether. You open the gates to particular requests.