Part of the problem, one suspects, is that the US media has a big urban rural divide - I.e. how devolved government sperform in rural areas which tend towards reaction get portrayed and criticised far more than liberal efforts in cities (which don't get nearly as much devolution as they perhaps deserve). But yes I do wonder how long a single United States can feasibly last... but then better men have said it before and they've been wrong too, so who knows how long the Enlightenment's Great Experiment can last...
The US needs to have federal city-states. More stars for the flag.
And also to eliminate gerrymandering and either eliminate or reform the EC to avoid the Republicans winning forever, even when the Democrats win the popular vote.