Well the altcoin market has blown up and many altcoins offer more to users than bitcoin does from smart contracts to real anonymity to real world apps. The question is whether or not bitcoin will always retain its market share as the first coin without innovating further on the protocol.
In order for Bitcoin to retain its leadership as a cryptocurrency, it needs to be able to process a lot more transactions than what the to be implemented Segwit can process. It needs Lightning Network or some other technology. It needs to have very low transaction fees to allow people to buy a package of gum without paying transaction fees that is more than the value of the gum.