That's what OP might want us to think of this situation, he must be a full time Elon hater. The sales of Tesla will still go up because people are still going to buy it with fiat and just because people are using crypto doesn't mean that we are special people, there are millions of customers that will pay fiat.
Hate is a very strong word, I won't use that on a person neither would I hate on anyone or anything without a reason. Besides, Elon Musk is what we could describe as a success and you don't hate on success. You admire it, envy it and use it to motivate yourself. So, hating on Musk is far from it to me, but I dislike the fact that his actions can create some mush turbulence in the market. That sh*t ain't cool no more.
Do you really think he will see a significant reduction in sales? I don't think there are that many people who were going to buy Tesla with bitcoin or are upset about this (even if they were going to buy it in fiat) and are no longer going to do so because of this.
On this, there are people that would always want to buy with fiat and as much, we have those that would prefer to stay anonymous on their transactions and buy with crypto, in this case, bitcoin. Kicking bitcoin out after a previous acceptance brings some sentiments to the Tesla market and in turn affects the bitcoin investors who would have preferred this option.
So, i do think it would have some effect on the Tesla sales though, I doubt it would be significant. One thing is for sure, fossil fuel isn't stopping anytime soon, altcoins too still use fossil fuel in mining though, it isn't significant as compared with bitcoin yet and then, not accommodating more medium of payment becomes a limitation. Variety is beauty.