Also Blu-ray players don't get updates after a long while too I've heard as YouTube and Netflix changes their APIs - the devs of these devices don't keep them up to date.
I would prefer a dumb TV, and just buy a replaceable box with the computer part. The only way I could see embedded software lasting is if the company made the firmware/OS across all their devices and made it more generalized to work with all their devices of that class.