I actually would remake "WWF Wrestlemania: The Arcade Game"
Of course change it to WWE, but give it an updated overhaul. Make it more of fighting game style similar to current fighting games out. Maybe closer to Street Fighter.
I'll have all the current WWE roster. Also past WWE superstars as well that you have to unlock. On top of that, have special achievements that'll unlock the original game itself.
Enhance their signature moves and make their finishers epic like Mortal Kombat (minus the gore and fatality). Give them moves/powers that fit their in ring personas. Like wit Undertaker, give him a updated soul throwing power he had in the original game.
The stages will be designed according to that particular wrestlers style. So for example The New Day will have their own stage where maybe there's a giant azzz box of Booty-O's in the background. Or if you're using Kofi, Xavier will be in the background playing his trumpet. While Big E be dancing like...well how Big E dances. Lol. Or have Randy Orton's stage actually be a vipers pit, full of vipers.
I'll also give each wrestler "cheat moves". Aside from them using steel chairs, sledgehammer, the ring bell, etc., it'll be other moves that gives them an advantage to help win. So for example, while your using Orton, he can pick up one of the vipers and throw it at your opponent. The viper latches on, and drains a lil bit of your opponents energy.
I got more ideas, but that's just a sample.