A game where the majority of what you'd be doing is riding a motorcycle for five minutes, getting off, putting on a disguise and walking around doing very little of anything?
...Well, you've done it, you've officially trumped a game staring Ocelot being the worst idea ever. --- I am a dedicated member of the "Walter Sullivan Is Bad-Ass" group!!! I am the true originator of the Cookie Demon theory on the SH2 and 3 boards.
Sure, why not. It would still be a mostly stealth based Metal Gear game, and Eva's particular set of abilities might open up interesting gameplay possibilities. So yeah, not gonna happen, but... bring it on.
Both Ocelot and Eva games would be terrible ideas. Eva is a Spy with some combat skills, not a solo sneaking/infiltration mission expert which is pretty much a trademark of the series for the main playable character. --- Float like a butterfly, sting like VC!
Yeah an EVA game would suck. By the time of Peace Walker/Ground Zeroes she is simply a retired/failed spy and the most useless and out of the loop member of The Patriots, sending Big Boss pointless reports that are of no use to him whatosever and consist mostly of stories about The Boss letting her government own her.