My honest opinion is that only 1% of altcoins will survive and prosper. The rest will just crash and burn and be forgotten. Ethereum is technically an altcoin and it's already popular. The more legitimate a project is, the faster it'll be discovered.
That's true because if the project is good and value of a coin is good many people will discover it and it will be popular like ethereum. And I think in altcoin its few coin have a great future oets wait and see what coin will be next like ethereum.