[sachmo]

A civil war in america will never happen again for one reason...you can't get enough Americans to care about something enough that they would be willing to SACRIFICE for it.

All of these signs you are seeing might be more your perception of the state of the world ("when I was young") then a reflection of reality.
I see the current state of public opinion as the conservative backlash to the rise of PC and liberalism. Just like the economy, this too will self correct. Eventually, it's possible that one side will imbalance the system, but I can't see a civil war as the ultimate solution to governmental problems. The citizens have too much power. They just need to use it.