"Is Socialism Inevitable? Is it Humanity's destiny?"
Not pure socialism, no; it has the same flaws as pure capitalism. But some kind of free market socialism, or democratic socialism, yes I think it is where we are headed, but it will be a couple of generations away still.
Free market socialism? What the fuck is that?
The markets are free, but more of the means of production, such as land, are owned by the society. Individuals or companies can rent it as part of their business plan.
For example, instead of Weyerhaeuser owning millions of acres of land, the land would be owned by the people, and Weyerhaeuser would pay to harvest trees from it.
Gets tricker when you are talking about intellectual capital (rather than land), and of course the various types of capital in between. Progressive economists have a model for it. Probably shorter periods for copyrights and patents.
Of course, a healthy tax structure is in place.