Bitcoin used to be at 95%+ and for good reason. It was the first, and the rest were copies. You question is as if they all came out at the same time. A boycott also requires for people to get together and plan it, but what you're seeing instead is the market at work.
Exactly, a boycott will require that we get organized and that a centralized party tell us what to do and we just follow their orders blindly, but that is not what it is happening here, each investor that is deciding to not invest in altcoins is doing it because of their own selfish reasons, I'm not going to invest in altcoins because I know that I'm going to lose my money and as an investor that is something that I do not want, why you should invest in those coins just to get scammed by some person in another country?