The biggest obstacle for alternative views is the "self-interest" of leading industrial and political classes, I think. They pushing forward this libertarism as de facto social legitimation. The power-holding classes made quite a progress in the recent decade in accumulating a critical mass of economic and political power. By now they are almost autonomous from the masses (and any "dangerous" ideas).

Several aspects of ideological isolation dynamics can be found in Naomi Klein's book "The shock doctrine". I will give two examples from there:

1. Prior to Pinochet's (and similar) coups in Southern America, the developing countries there were quite on their own way of building their societies and economies, independent on either Moscow's socialism or Washington's capitalism. The governments were pro-active and positively interested in building egalitarian social structures. Naomi Klein even uncovered a letter of Kissinger, where he expressed urge to intervene not because the Allende government was terribly pro-Soviet, but because it was building a more attractive alternative economic system. The South American coups resulted in quite a genocide of any leftist sentiments. (But now South Americans apparently build some autonomous anti-libertarian relations anyway.)

2. Friedman's economic theory had a marginal academic status until the 1960-1970s, until Wallstreet-backed think-tanks started to support his convenient Chicago school handsomely. Their academic status still rose very slowly, but they were very active in recruiting and educating students from developing countries (from Chile, especially). They took full initiative with Reagan and Teacher. After they "took over" IMF and the World Bank policies, libertarian ideology was offered as the "Washington consensus"  all over the world, from Bolivia to Poland and Russia, from Mandela's South Africa to "pragmatist" China.