Blockchain games will also be huge. There are so many people who have played games like World of Warcraft, bought items and sold them back and forth with other players, whole characters were sold on the internet for good money. I expect that to happen for NFT-based games as well.
In game transaction already happening in nft games. Most of games that are blockchain based have marketplace for their own game or even implemented in game so what youre talking isnt a new thing in nft game nor its gonna coming up as a feature because it already is a feature of nft games.
Even most of people already expecting nft to be a solution for in game transaction and probably even the whole point why many games use nft in their system.