This is all bonkers though.
A dumb-tablet isn't going to be able to stream games well enough for Nintendo, you will have lag. The video will have to be rescaled, compressed and decompressed. And at 6" the resolution is going to involve massively more data than the already laggy PSP/PS3 remote play.
If the tablet isn't dumb, and has its own CPU/GPU you are massively escalating costs, taking that expenditure away from the console itself, and it becomes standalone which would compete with the 3DS.
Dumb tablet which doesn't work well and can't leave the house = ridiculous.
Smart tablet = competing with themselves.
None of it adds up.