I doubt they 'll go over the edge - we (especially on here) always overestimate the chances of repressive regimes disintegrating.
More likely is a serious loss of belief in the Party, people going over to the old Russian work ethic ("They pretend to pay us, we pretend to work") with the Govt having to resort to western style handouts to shore up bits of the financial sector there. Generally speaking a slow down rather than a collapse.