We probably have multiple alts that one could consider as better version of bitcoin but as you're noticing, bitcoin is gaining more popularity and a fast growth. The price is not a measure of a coin success so what I'm referring to here is the the number of ATMs, exchanges, stores, services, and people accepting it.
So even If we have some people using alts currently because they believe they are better then bitcoin (which may be true), bitcoin is evolving and the development is super active and exciting times are coming. I honestly believe that this make alts useless (say, by the end of the year), your thoughts?
Of all the features of a cryptocurrency that is capable to be adapted by the majority of crypto enthusiasts is speed and scalability. Bitcoin has the least in terms of speed so Bitcoin could be never accepted as to be the payment for fastfood and other quick trade services because Bitcoin's network cannot handle congestion loads therefore Altcoins are taking over.
You can't say that Bitcoin would be the main star of this Crypto Market because without Altcoins Bitcoin isn't that much appreciated and adaptable.
What I'm going to say is, people put trust on Bitcoin because it is complete decentralized and the code is completely transparent but if only Bitcoin is the only Cryptocurrency is circulating today there would be less people who are using it because of the effectiveness like transaction speed couldn't accommodate massive transactions.
Altcoins are still better than Bitcoin just except whales will turn their back on Bitcoin then Bitcoin will be just the part of history.