I got my Google TV the first day it was available. I own just about every other Internet video appliance, too. I figure I make my living from technology, so tech gadgets are my one vice.
I see the networks blocking GTV access as a desperate roadblock effort to hold onto the past as long as they possibly can. They know it's inevitable, old media's monopoly is crumbling and they are having to change to serve the viewers instead of themselves. They wish it wasn't happening, but like printing press publishing and record stores, their destiny is clear.
It's like Hulu having an iPhone app, but blocking that app from being connected to a TV. Hulu plays on your computer, but not on your computer through boxee. Do they want viewers or not? They are definitely conflicted here. (Hulu is a partnership with a majority ownership by big networks.)
The big networks are simply holding onto the past as long as they can. I recommend switching to alternative online-only networks, to help make that transition period as short as possible.