The cancellation of B2X might change that. Bgold futures dumped on the news, and so did Bcash. Regular altcoins (non-Bitcoin dividends), on the other hand, rallied. It might not be the bottom for altcoins, but this kind of relief rally will allow those coins that haven't bottomed to breathe, and the next dump will probably be the last.
You're right that we can do nothing to stop them, though. But people will care less and less. Apparently something called "Bitcoin Silver" is coming out, but does anyone even care anymore??