Earlier quoted context omitted.
This is essentially what I've done. The TV has never been connected to the Internet and my Apple TV drives everything. I would still have payed 2x to support a good dumb TV project and would love to do so in the future.
But isn't a dumb TV + Apple TV pretty much the same as a smart TV? (I know, you avoid dealing with two "smarts," but still...)
That difference in power is felt quite a lot in the user experience.