If that were to happen, I'd hope to high hell that they'd rebuild it from scratch (as in scratch the game engine it uses)...and NEVER use Studio Gigante EVER AGAIN!
What makes this bad is that the Xbox games don't have a foundation game (series) to use as a starting point. For example, SmackDown! games (and SmackDown! vs. Raw) use Toukon Retsuden (New Japan Pro Wrestling game) as the foundation (Yuke's does the Toukon Retsuden series as well), and the GameCube games (and even the N64 games) were based on VPW (IIRC, those were done by Aki/Asmik).