Here's what I think.
How many times did I get together with friends and play local multiplayer DS games? To be honest, not many. I find that part of the fun in local multiplayer is sharing a screen. I've been to a couple LAN parties. The low lights, blank faces, pyramids of Mt Dew cans and mist of body oder were enough to convice me that a couch, a buddy, one TV and Rayman Origins is the kind of multiplayer I'm after. I don't think that will be quite as fun if both players are darting back and forth from tablet to TV. Won't I just want to keep my eyes on one or the other? And speculation aside, I _know_ that the power to stream to the tablet takes away from the ability to render on the TV. Ya wanna know what I really want in local multiplayer? A couple wireless Classic Controllers and a stunning new version of Mario Galaxy, Rayman Origins 2 (yeah, I saw the trailer... the tablet sections looked slow, lame, and utilitarian. Also perfunctory). And make it a Diet Coke, thank you.