NFT now very popular but it is a morden trend. It is hard to say how long the popularity of NFT will last.
A lot of depends where NFT is used, how useful it is.
Now NFT is actively used in gaming and if game is popular will be demand in NFT.
Liquidity is very important for altcoins. Altcoin must be in demand to have big liquidity.
NFT is actively used in gaming. Games already have big liquidity. It allows increasing liquidity of NFT in games.