Or even more simply. Browsing a webpage from 10+ foot away is a horrible user experience and even more so for the people watching the other person browse that webpage... Maybe the reason the WebTV and GoogleTV are struggling to find a market (other than the lack of content deals).
Would you rather browse a webpage from your tablet/latop or from your TV (with or without people watching TV with you)?
I agree that browsing a webpage not designed for a TV is usually a bad user experience, but web pages designed for a TV need not be. It's not the web browser itself that creates a bad user experience. Your not making a distinction between a web page and a web browser.
A web browser can be developed for the TV that is perfectly usable using only directional keys, and a small keyboard.
The main draw to internet enabled TV's are the ability to stream video content from the internet to your TV. I would rather have a browser available, even if it does give a bad user experience, and have access to all the content already available, then to wait for a widget to be developed.