It's a fringe brand in that Ferrari is a fringe brand. I don't think most people wouldn't want one but I don't know a soul who has one. Very few have seen them. They aren't exactly a larger brand. IF they can mass produce a model in a reasonable price range comparable to a modern model of car it will take off. Right now it is in the fringe but I don't think it will stay there. That's exactly what the guy in the article said. He didn't say Tesla was a bad idea or that it won't take off, he said it's not there yet but this next model could very well take it there.
It will be exciting to see where we go from here.
It depends on where you live. In California they are almost commonplace, especially in the metro areas. A closer cousin to Tesla than Ferrari would be Audi, BMW, Mercedes, Porsche, etc. They are expensive and only the affluent can afford them, but not so crazy expensive that you need to be a CEO or rock star.