I agree that it is very important to have a big ecosystem of the coin. It must be useful for people to be in demand.
Now many meme coins are actively used for speculations and they allow to earn money. That is why they are in demand.
Because of meme coins are actively used for speculations and for trading they must have a good liquidity.
To do this they need listing on big exchanges with good liquidity and a lot of promotion to attract attention.