Yes it is possible, in the future we will only be able to use Bitcoin in application areas. altcoins are not doing the expected in recent years, do not show their importance. so the Altcoins delisted and only Bitcoin remained
Though bitcoin staying to be the only one crypto is not against my favour but dont you think that if the market have more than one reliable currency it will be better?. The idea of making bitcoin code open source by satoshi himself Im sure is to facillitate people into creating their own cryptocurrency whether for public adoption or private.