Anonymous anything will be the first to go!
What do mean, "will be?" Anonymous anything is gone, because Comcast is judge, jury and executioner. Since the Bill of Rights applies to the government but not corporations (to the extent that it applies at all, but I digress...), moving internet service from corporate control to government control is a way to get anonymity back.
Sure, illegal government surveillance could continue, but that situation is already infinitely bad, so it can't get any worse.
The next issue is going to probable cause, uploading to much? Well you must be a criminal copyright violator and their will be be a warrant to search your computer so fast your head is gonna spin.
What, and you think this isn't already the case?! At least if government were the ISP then the police would have to get a warrant to find out how much you're uploading; right now Comcast will just voluntarily tell them!
You don't want Government to have that kinda of control Look at Turkey's internet crack down!
And you think Comcast would act any differently?
Here's the bottom line: you're saying government control is bad, and I would tend to agree. However, my point is that we already have that, except the enforcement has been outsourced to crony capitalists in order to do an end-run around Due Process!
There is no difference between Comcast and the government, except that the government has to at least pretend to respect your rights.