Socialist effects on the American economy? 
Are you unfamiliar with what socialism is, or are you unfamiliar with the American economy?
No, and no. Are you denying that there are socialist elements to the American economy? Government guaranteed pensions, medical care, retirement, high regulation, etc? Perhaps you're the ignorant one.
Government control =/= socialism. The welfare state =/= socialism.
False. It's degrees of socialism, particularly to the extent that the government gets into the business of providing private goods such as an income, health services, student loans, venture capital loans, etc.
If government control is socialism, then the US has been socialist since 1775 with the establishment of the US postal service. If the welfare state is socialism then nearly every country on earth is socialist. If universal health care is socialist then every modern nation on Earth besides the US and Mexico are socialist nations.
All are elements of socialism, and nobody that I'm aware of has ever claimed that there has been a purely capitalistic society within recent history. Just pointing out that the more government moves toward socialism, the worse it becomes for everyone. Your argument is a red herring.
The word gets thrown around loosely in the US. Socialism is a mode of production, it's not the degree of state intervention in the economy. Mussolini wasn't a socialist, neither was Franco, neither is Putin. In the 20th century, socialism became synonymous with Leninism in the US. The communist revolutions of this era all followed a Marxist-Leninist template. The USSR, China, Vietnam, Laos, Cuba etc all took a vanguardist approach to implementing socialism.
The US has become by degrees more socialistic than it was in 1776. Frankly, I've seen the No True Socialist fallacy used before, and I don't find your version very compelling or clever.
As for the original topic:
yes, global communism is inevitable. When you imagine the world 50, 100, 200 years from now do you see individuals owning bits of land and having other individuals produce for the land owners? Or do you see a cooperative society without individual ownership of the means of production? Our supply of cheap labor isn't going to last forever, eventually capitalism will be impossible. Capitalism will come to an end before human labor is entirely automated.
Capitalism is always and will always be possible. Nothing humans can do can make capitalism not possible.
