It's a nice idea, but I think the problem is that there is a lack of standardisation and there is such fragmentation nothing is likely to be developed soon.
For example, I have recently bought a sony TV and a blu ray play. Both support some form of access to the internet (applicast for the sony and vieracast for the panasonic). Both are closed formats that I assume you need to license before applications can be developed.
I would like iplayer on one of them, but it's unlikely because I imagine the bbc has a huge queue of devices to port iplayer to, and for each one you have to go through the rigmarole of getting licenses etc (and worry about who is going to pay for it).
In the absence of standards a better approach would be for the manufacturers to publicly release enough details for people to be able to develop apps themselves. As it stands they will just frustrate people who bought these things on the basis of having some useful internet functionality and in reality getting something pretty useless.