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Doesn't the Shield just run Android though? I mean there's the Razer Edge, but that looks like it needs a few more years of polishing before it's likely to take off. My 3 year old Surface Pro 2 can manage to run GTAV and MGSV at 30fps (albeit at 720p), so I don't think it's too far beyond the realms of possibility.
I mean we're not going to be cramming a pair of Titans in a GBA case anytime soon but having a decent chunk of your Steam library in your pocket would be pretty awesome
There's stuff like the nvidia shield, but that's streaming.
I don't think you're going to get pc level hardware in a handheld.