Yes.
RMS is concerned with morality, ESR with practicality.
Also yes, for some definition of “practicality.”
The open source movement is just as ardent, just as committed and just as "extreme" as the free software movement, but more successful.
I don’t know how to measure commitment, but I agree that the open source movement is more successful in the sense that it is more popular.
But what else should we expect? If you take two groups with similar ideas, but one thinks of moral arguments as a way to achieve practical goals, while the other thinks that practical arguments are a way to achieve moral goals, you should almost always expect to see the “practical” group be more successful than the moral group.
I see this in school, where students who study how to pass tests get higher marks than students who study the material to learn. I see this in business. I see this in politics. Why would we expect to see anything else in software?
no, we don't need RMS
I think that’s a fine statement to make if you qualify who “we” are. If you mean people concerned with practical objectives, you may be right. I caution against rhetoric that might be mistaken for suggesting that your point of view encompasses everyone reading your arguments.