Even if they have a significant market presence of new sets sold, you'll still have a gigantic install base of 1080P sets in people homes for years after.
And I dont know of a single affordable 4K TV. I've heard of a few decent sounding monitors coming right now, like an Asus and that Samsung, for probably $600-$800, which is still pretty cheap. Ignoring those cheap Seiki's. Even those Asus/Samsung monitors sound like the first 4K stuff that you'd actually want (single panel, 60 hz supporting, etc). That's how early this stuff is, they're literally still sorting the basics out, not ready for prime time yet.
Again you're looking at years to get significant in home penetration, if then, by which time current gen will be winding down anyway, as predicted leaving it a problem to be addressed by the next gen.