If steam can get on pc, mac, linux but also on tv, tablets, and run game fine they will own the market.
I am pretty sure all major companies are working on that right now. We can see that in ads right now.
eg. mac share pictures around other macs(tablet, phone and laptops)
WII u can go from tv back to Wii and then go back to another tv and it seems wireless.
I know also that microsoft is working on something similar from pc, xbox and tv's .
The first one to build solid technology will get the most of the pie.