The West needed 30 years to realize that (some are still working on this I think) because it thought that it had actually 'won' the Cold War through it's actions during the Cold War, when the reality was much more likely that the East had collapsed also without much 'help' from the West.
The countries on the 'losing side' in this battle of ideologies (like the Soviet Union and China) had adapted to this new reality much more quickly, both in different ways though, but none of them copied the 'obviously superior' model of the Free West.
Of course hindsight is 20/20, but sometimes I've got the impression that many people in the West still wear their rose-tinted Cold War glasses ;)