Generally, the concept of two devices being combined into one is called convergence.

Specifically, a wierd idea that the television is going to take over the function of your computer, and every other useful device in your house (i.e., your stereo, your VCR, your toaster, etc.)

It makes a certain degree of sense- there's a lot of duplication of function between some of these devices. However, I think the TV is too low-resolution (even HDTV) to act as an effective monitor.