The GENFORCE concept featured an eastern OPFOR divided into legacy “Basic” and more advanced, mixed, “Mobile” forces. Yet how many formations of the latter would plausibly exist in a nation the size of the USSR?
I found a possible answer in a 1985 CIA analysis called “Trends And Developments in Warsaw Pact Theater Forces, 1985-2000” (a great source for a continued Cold War in its own right). The mobile combined arms corps, effectively a big division, is mentioned.

Obviously assuming a surviving USSR and Warsaw Pact, the document estimated that nine such corps would be ready by 2000. Three of these would be in the western theater, two in the southwestern, and one on in the northwest. Two would be in the Far East and one in the south/middle east.
180,000 personnel would be needed from a napkin calc of corps numbers x paper strength of each corps. It’s actually closer to the actual number than most because existing tail assets could be used to support them. However, there will be undoubtedly more people than that necessary, especially to have them achieve their full potential.
The problem isn’t getting that many soldiers. It’s getting that many good soldiers, especially because these mobile corps are specifically designed to be better and more complex tactically than previous line formations. And because they have to compete with the airborne and naval infantry for the best inductees.
Interestingly, the document itself also mentions the possibility of the tank divergences continuing, with the basic forces (word choice deliberate) getting a less exotic model and the mobile corps getting a more out-there one. This would also coincidentally make two bureaus/plants very happy instead of one, so I can see it happening.
It’s an interesting document in any case.