Games of the top of my head that would of likely come out or needed to be on the Amiga Walker / A2400 type system are:
Games that have since been ported and would of ran on Amiga Walker spec system plus very likly got a release.
Doom, Quake, Myst, Command & Conquer, Transport Tycoon, Decent, Duke Nukem, TFX, Space Quest 5 + loads of other adventure games that ScummVM can now play.
Games that are left to be ported that would of likely ran on a Walker system and might of made release:
Theme Hospital, Civilization 2, Worms 2, x2, Wing Commander 2.
Games that would be nice but unlikely to of ran on the next Amiga
Tome Raider, Wipeout, Magic Carpet, Half Life.