Right now, I'd have to agree with you--it seems like all the money being used for crypto investing is going straight into bitcoin instead of altcoins.  But I've seen that happen before, and every time things have gone this way, the altcoins will usually rebound once the bitcoin market takes a break.  So yeah, I'd say right now might be a fantastic time to buy some altcoins--but only if they're good ones, and that's the rub.  Most of what's on the market is complete garbage.

Take a look at some of the "bigger name" altcoins (LTC, Dash, ETH, etc.) and buy some of the ones that have crashed in the past 5 months or so.  My guess is that they're going to bounce back.