Altcoins are a kind of bridge between people and bitcoin. That is the more cryptocurrencies, the wider the use of blockchain and smart contracts, the more people will learn about Bitcoin and how to work with it. Decentralized technologies are the future and many processes can be transferred to them. Even the treatment of diseases will become better and more accessible if the experience of all the doctors of the world is stored in an open independent network and everyone can use it. Alts will be used widely (not all, for sure).