Those who are new to crypto tend to get drawn towards Bitcoin, while most new altcoins only get noticed by users already familiar with the technology. It's difficult for these new altcoins to get exposure, so I guess those who are familiar with the ropes of crypto will find the new ones easier as opposed to beginners starting off their crypto journey with a lesser-known "brand". However, if for some instance that someone actually kick-starts their crypto adventures with an altcoin, chances are they will gravitate to Bitcoin as well. But all in all, I think Bitcoin and altcoins do their part in spreading the benefits of crypto.