Any altcoin can have a fantastic future. Many, unfortunately, show only the initial rise, followed by an irretrievable fall, some projects just throw. In this situation, you should not bet on only one coin. Study the market, choose 5-6 coins and bet on them. At the end of time and the exit of other coins can, and sometimes need to reconsider their preferences.
I agree that almost every coin has a chance for a beautiful future. And many altcoins have this chance in the short term. But if we talk about the long-term perspective, I think that altcoins will remain around 10, which will offer users completely different opportunities. The other projects will not be able to realize themselves, as they will not withstand competition. This is the law of nature - the strongest survive.