They have to dial back the combos a lot from 3.
I do think stuff like ground bounce, wall bounce and OTG are good ideas. In Marvel 2 the effecient/damaging combos were kinda limited to characters with aerial options so cast with limited damage from launchers were a lot worse. Marvel 3 fixed that issue by allowing characters many ways to combos meaning no matter what type of character you were, you had access to damage.
This had the side effect of having long combos where characters like Vergil would do a wall bounce combo, an air combo, OTG, ground bounce combo then combine with double assist combos (in Marvel 2 you could only use one assist in a combo) for some really long combos.
They have to dial back the combos from Marvel 3 for sure. Anything that is longer than a Wolverine non Fatal Claw/Berserker Rage loop combo is too long.