you have a good point., but I think it's hard to judge right now since the market is so bearish. Analysts say we're in for a steeper crash. And after all the new FUD... I dunno.
I think that it's fair to say before this crash, BTC, eth, and other bigger altcoins have been steadily growing in volume and price. Despite that, smaller altcoins were growing too. That means i don't think they were draining the main alts.