There some altcoin are shams and they have no real life product except few. Cryptocurrency world is most competitive market there are so many altcoin doing their business but most of them become unsuccessful and wipe out from the market. most of all altcoin are worthless and really cannot do anything or solve a certain problem.
Only few coins have a real solution for a real problem and in addition most of the other's coin has little to no use cases.  There is a logic that nobody can dominate any market or anyone can rule alone, as bitcoin can’t rule alone. Because cannot be impossible to carry out the crypto market without altcoin. If Bitcoin survive then of course altcoin will survive because bitcoin need of altcoin if bitcoin wanted to survive. But it’s true all altcoin won’t survive who has no good vision. All the altcoin’s targets are not the same.