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
Old ideas is not completely bad if there is no one did well yet. So, the most important thing here is no matter old or new ideas, but how they do it. Like Defi, there are many projects and companies are focusing on and build it, that is completely natural because Defi is the current trend and next trend in at least 2 years. Finally, the market itself will reject which bad projects.