Well, they were, by and large, in control of the country almost as much as the Coalition is today at some points.
Notably, they couldn't deal with Muj tenacity and the mounting casualties (nor did they have as extensive a measure of control from the air).
The question is HOW do they "crush" the Muj?
This could have large consequences. "Afghan" soldiers brought with them a lot of disillusionment, criminality, drug addictions and a sense of displacement/not belonging, and the impact they had on Soviet society was profound. It made its way to the kitchen tables, the arts and the media, and Russia was still recovering from it in the 90s (before Chechnya happened). It took any remaining appetite for armed control and war in general right out of the Soviet people.
Had the victory been more decisive, who knows?