The more people will use NFT the more popular NFT will be.
Even now there is a big demand for NFT. But if the price of NFT will continue to rise to the demand in NFT will increase.
Many people buy NFT and use them for investment perposes.
When NFT is used in game a lot of depends from the liquidity of the game and how many users the game has.
The price of NFT depends from demand in it and game must have a lot of users that the price of gaming NFT continue to raise.