I personally don't find him that charismatic in the salesman sense, at least in his presentations. He may be different in person. I do think he has some marketing talent but I think most of it comes from his legend, and that legend has resulted from a history of shipping very impressive stuff. He does not strike me as having a lot of the type of charisma that would work minus his reputation factor. Keep in mind that he was very rich when he started SpaceX and took over the skeleton of Tesla, so he had the capital to prove himself before having to seriously raise and sell.
So yeah, I think there are a decent number of people walking around who could do the sort of thing he does... maybe 1%-2% of the engineering profession if I had to guess.
Why are there not more actual Musks? Because the skills and interests that get you rich are typically not these. They are skills like charisma, charm, social networking ability, etc.