You may want to persuade me that socialism is forever, but I see no reason why this is so. Both in America and in European countries, statist programs are sometimes cut or abolished, activities previously illegal are legalized, state-owned industries privatized. Owning gold used to be illegal. It's true that over the last seventy years, statists/socialists have won many of the battles of the war of ideas, if you will.
But this does not mean they will continue winning. In fact, there exists plenty of evidence that the tide has begun to turn around the 1980's. Even this so-called triumph of Progressivism they call 'health care reform' isn't that much of a triumph.
Worse yet, your argument is a logical fallacy. Either this, or this, but either way not really logical. :D
MB, you are 100% correct in your instinct that socialism can not last forever. Maggie Thatcher saw it from the non-empirical common-sensical side and pronounced, "Sooner or later you run out of other people's money."
Well, back in the 1940s an economist (whose name I can't place at the moment) determined that socialism was unsustainable. He had studied Germany from Bismark's implementations of socialism on through the UK's growing socialist state a well as France. He determined that the greater costs imposed on producers caused producers to have fewer children and spend money on maximizing their current comfort. The result being a population that not only no longer grows as socialist ponzi schemes must, but the most productive classes are the classes hardest hit, leaving disproportionate numbers of the less-capable. Think Detroit on a continental scale.
There are two ways a socialist system can end up. First, is excising the worst socialist bits to allow the system to soldier on longer. The more socialism excised, the longer the system exist. The other way is that of Weimar Germany, Greece today, Argentina several times this century: a systemic collapse, as reality catches up and bites the system in the ass.
Which is yet another reason to oppose socialism, as it will cause worse problems than it will solve.