Many new altcoins will die in the future because there won't be many investors investing money on them and as we know it we have many scammers here who will keep creating useless tokens and coins, if you are a developer and you think you are serious enough then try as hard as possible to come out with something new and different, enough of repetitive projects and same old ideas
Bring in something NEW or don't bother at all
Its easy to say that OP but establishing a new and complete different unique project is hard. Almost all new projects if not improving some lack on previous project are just creating same concept.
What use case in reality does not have a platform yet? I think almost all are already taken. If you think about it, not all fields needed blockchain hence putting unnecessary new platform is waste of time.