The same question was asked when bitcoin was new. We now know the answer to that. The same can be said about altcoins. But not all alt-coins will have the same future as bitcoin. If it is just a copy paste of bitcoins code, then it will be trash. If it does not offer something new or any added value, it will be trash. But if it has a unique characteristic that can be valuable, then I say that coin have a future.
Exactly. Like not all altcoins can survive in the crypto world, some are just for short term and when its lucky enough it till survive for a long term. I think it depends how the market is playing so it will not lose its value. We can't say what altcoins have the future but we all speculate from its market cap and community support. It will change over time but for sure some will survive.