The first assumption is put by Marxists (and others) in this way: that socialism is the “only alternative” to capitalism. They then assert, in effect, the following syllogism: since capitalism is not going to last (which we have granted) and since socialism is the only alternative to capitalism, therefore socialism is going to come. The syllogism is perfectly valid, but its conclusion is not necessarily true unless the second premise is true: and that is just the problem in dispute.
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