I consider the socialist system of Cuba collapsed when they began capitalist reforms, Castro has pretty much admitted that Cuba is not going to survive without capitalism, if Castro understands that why are you peddling something that even Castro himself has admitted doesn't work
So the question still stands why are you advocating a system that was forced to turn to capitalism to survive? Why are you promoting a system that has already been shown not to work
If you consider socialism to have collapsed in Cuba due to reforms, then capitalism in the OECD countries collapsed in the late 1800s/early 1900s with the introduction of universal education, firefighters, progressive taxation, social services, etc.?
I myself am not an
advocate of state socialism. I do recognize that it can lead to important gains for the working class, though, such as improved health care, literacy, hunger eradication, etc. These are gains that have been made in many countries that adopted socialism.
However, again -- being that all these countries attempt to build an alternative economic model in a capitalist world, they are interfered with and undermined by outside powers and internal bourgeois elements. Socialism in One Country is an untenable proposition, largely due to that and also because individual countries have limited resources. What country really survives a state of autarky?
Even capitalism can't function in isolation like that. Hence why
capitalist powers went around the world destroying barriers to capitalist expansion. Markets were opened up by force in the 1800s and 1900s (this still happens today -- Iraq in 2003 for example). Colonies were taken so that there would be more markets for goods -- look at the language senators used to justify the American occupation of the Philippines for example.
Capitalism is a world system and socialism would have to be, too. The working class is a global class.