How about a limit on how long you have exclusive rights on a house you built, and did not sell? Okay, how about the exclusive rights on your blog that attracted a million subscribers? Should a government agency regulate what you post there?
I'm afraid this is a slippery slope leading to things far more dangerous than we have now.
I agree it could be a slippery slope but we are nowhere near it today. A published work copyright expires 70 years after the author dies, or something similar. That would probably apply to a blog post. 70 years post death is pretty reasonable. Not sure what a reasonable number for a network would be, but I think "forever" is excessive in the other direction.