You have to look at the bottom line. The only benefit of decentralization is cross publisher items. If it's through the same publisher it can be done in a centralized way. Publishers care about their profits. If NFT can increase their profits they will do it, but if someone buys a WoW sword on Etherum and uses it in Destiny (I haven't played either so please don't nitpick that Destiny has no swords).

Why would the publisher behind Destiny care? Blizzard is the one profiting off the items. Each publisher would create their own mutually incompatible smart contract to maximize profits. Companies absolutely hate the existence of secondary markets. They want cash shop items to be tied to accounts so that every player has to rebuy the same items over and over again. It simply won't work except as an easter egg.