In terms of varied features there were more altcoins that are better than bitcoin as stated in the above quote. In terms of liquidity bitcoin takes the lead, and this makes bitcoin to be the much used one than many other cryptocurrencies with advancements. Already there are few coins created by banks were getting used for transaction within country and bitcoin for cross border transactions.
It is not that I am being biased in my judgment or because of the interest I have in BTC, I also have some good altcoins I have invested my money and time in but none of them has been able to meet up to the standard of Bitcoin, those altcoins are just being over hyped and there is nothing absolutely new they have added to the system, other than using it as means of raising funds for their project.
Before the invention of BTC, if they were so good, why did they not come up with an idea and they had to hide under the shadow of Bitcoin, let us leave matter where it is and be sincere to ourselves, few of these altcoins are the ones with real products, many of them are just shadows of themselves.