>I kind of liked the idea of NFTs as part of an asset portability system for virtual worlds. Goldman Sachs even endorsed that. I was thinking of this for items in the US$1 - US$100 range, like game items. The transaction costs would be too high if it took a blockchain transaction to walk through a portal, even for the cheap blockchains.

This is theoretically possible on Zero Knowledge rollup L2s (two strongest contenders are zkSync and StarkNet) if they achieve sufficient scale but definitely wouldn't work on monolithic chains (not even relatively cheap ones).