Smart people would think like that but there are many people that will listen to everything he has to say and will act upon those statements.
I know that it does not make a lot of sense but that is what will most likely happen, after all just in this forum there are people that are following every single post that Musk makes on social media and there were even people that created a bot which could trade the markets based on his comments, so as much as we think that Musk becoming a full-time influencer will be bad for his image there are many people that think the opposite.
Unfortunately only the smart people will make a profit, there could be some idiots who think what he says is important and even end up making a bit of profit but that is something very temporary, because if you are an idiot who believes Elon as a good indicator to buy which coin then you are going to end up losing money eventually, maybe in this trade or maybe next or maybe something totally different eventually one day but you will definitely be able to lose money one day.
This is why I do not look for others when trading, I look at the fundamentals of it and end up making a profit because I did my research and that is how I earned my money.