The SHIELD from NVIDIA is a pretty controversial device. People can't agree on the fairness of the pricing, people can't agree on the design, people can't agree on the usefulness of its features like game streaming, and people can't agree on the future of such devices.
I'm going to make a bold prediction here. If SHIELD fails, something else will rise up to take its place, and Android is the future of portable gaming. I really do believe this. For all the nay-sayers, I should make a calendar reminder for myself to dig out this thread in a couple of years so I can be like "yo, dawg, when's the last time you used your PS Vita?"