Certainly USB would be easier since it is a software/driver solution. And I think it's hilarious that War Thunder supports almost everything. It's just that for Rock Band in particular, everything at the end of the run was wireless.
Oh I hope I'm wrong when it comes to this. lol
The fact that MKX is supporting old sticks is a good sign, but Netherrealm doesn't really have a stake in the arcade stick game as far as I know.
Sorry, should have mentioned that everything worked by plugging the old PS3 dongles into the PS4, then using the instruments wireless (the only thing that didn't work properly was the RB3 keyboard)