And a common cause for creating that sentiment (that applies to everything from Rome to the USSR to the US) is Empires naturally tend to spend an increasingly disproportionate amount of their time focused on affairs outside their borders rather than within them. You have urban left leaning types becoming increasingly anti-capitalist, and the more right leaning and rural types feeling neglected by both internal and external policy.
People agree on less than ever, but the one thing they all agree on is that the system sucks. This will likely result in over more radical shifts between presidencies. You end up with a country that's starting to feel a lot like a boat being rocked back and forth with increasing vigor. And obviously this isn't just the US. It seems many political systems throughout the world are headed towards dramatic shifts.
One can also look to examples like the US which survived numerous catastrophic economic collapses, like the Great Depression, wholly intact.
It's disputed. Some say it was top down, like USSR could roll tanks as usual when republics protested but it didn't. See https://en.wikipedia.org/wiki/Dissolution_of_the_Soviet_Unio... and talk https://en.wikipedia.org/wiki/Talk:Dissolution_of_the_Soviet...
To put this another way, would the USSR have lasted longer if not for Gorbachev? Almost certainly. Would the USSR exist today if not for Gorbachev? That, I very strongly doubt, certainly not in anything like its historic character. It's similar to e.g. slavery in America. Did Lincoln end slavery? Absolutely. Would slavery have ended without Lincoln? Absolutely, and perhaps in an even more desirable fashion.
[1] - https://en.wikipedia.org/wiki/Xi_Jinping#Early_life_and_educ...
Dissatisfaction was present earlier, just that Russia was able to crush it.
USSR collapsed due to partially inability and partially unwillingness to murder people again, like they did previously.
"Wholly intact" might be stretching things, unless you see no problem with describing someone as surviving Alzheimer's "wholly intact".
The Great Depression did a lot of damage to individuals but FDR's response to that, and later the war, strengthened the US as a nation.
As Russia itself was cohesive, I guess you could analogise e.g. Texas to Kazakhstan (leaves), and Alaska to Siberia (remains)?
* as it was understood at the time, and to my limited grasp of the history of such matters
For better or worse Trump seems to have been an antidote to many right wing shifts in the western world.
So. Much. Winning. I'm sick of winning.