If you want to have it both ways: in the medium term, some capital may flow to altcoins because of some temporary non-money feature they offer. But on the long horizon, whatever functions as the best available money wins, and as long as that actually is Bitcoin, then much of the capital locked up in "altcoin feature" will get reallocated to Bitcoin.

Having demonstrated a willingness to exit the legacy system once, that capital seems more likely to then move to Bitcoin.