I'll toy with sizes and properties. Might make it a FPR style if it works.
The idea is 4 games within 1 game, allowing a different set of 81 characters and ten arenas each. 324 wrestlers/40 arenas. It'd have to be AKI style due to the graphic/code overload.
Rather offer one distinct promotion / era, it would be more geared towards an "anthology" or split promotions.
Examples :
Game 1 - classic wwf
Game 2 - 90s wwf
Game 3 - attitude
Game 4 - invasion
Game 1 - WCW
Game 2 - nWo
Game 3 - WCW vs. nWo
Or for say, the ruthless aggression project, keeping it hi-res, but splitting between playable brands.
Game 1 - Raw roster
Game 2 - Smackdown roster
Game 3 - Total WWE roster
The player would choose their game type at the main menu, to give a customized experience (menus/interfaces/etc.)