At the moment we have one tv that is also used for the wii and playstation. Gadget-mad dh thinks eldest son (11) should have one in his room, but I say he's too young.
I think it's worked well for us so far, making us all negotiate our "screen time" with the rest of the family. DH thinks we're turning into 'that weird family' like the ones we were at school with who didn't have a telly at all!
If I give in, I'm worried that it will be a games console next, and before I know it PFB will be skulking in his room all the time and only communicating in grunts. I seem to remember my brothers being like that from about 12 or 13.