Now, as every good Thathcer-Reagan fan knows, Soviet collapse was the result of the policies by these two politicians during 1980's. Never mind the the long-running problems from economical to ecological, or massive arms spending which did not move a bit during 1980's etc.
But what if Soviet Union collapsed already during 1970's? POD could be no Oil Crisis in 1973 which gave a short but important financial boost for USSR. So, say in 1975 Brezhnev dies and the new leadership aims for reforms but as the end result Soviet Empire collapses peacefully in late 1970's.
Does the Post-War consesus and Keynesianism continue "forever" as they've been vindicated by fall of Communism?