If studios are having copyright problems, it seems silly to shorten the length of the copyright protections.
You are right that this is not the government’s responsibility, although I never claimed that it was.
On the contrary -- if the government can't enforce the legitimate prerogatives of copyright holders, that's all the more reason to scale back the excessive ones.
The situation is similar to the "gun control" issue: even leaving aside the basic philosophical issues, it's stupid for the government to micro-manage magazine sizes and whatnot when it can't even keep dangerous criminals off the streets.