When, not if, it goes out of fashion, thete will be plenyy of parents grimacing at their inscriptions.
I am almost sure that almost everyone both minting and buying those knows it, like for real, we had cryptokitties, we had tons of NFT before, they all know what's coming! Probably there are also a few who truly believe they have future, for sure some that have done it just for fun, and so on but I really think the majority knows how this things end.
I remember a time in the HYIP schemes when everyone that participated in them knew they would flop, but the thing was that the first ones would get their profits, so they participated in a clear ponzi scheme but treated it as a betting game, trying to make sure that they get more than they lose, so my guess is that most involved with ordinals do the same, mint before it's too late, buy and try to sell for a small profit, all before it goes down. One has to remember that despite being somewhat foolish these guys are still one tech level above the average Joe that was purchasing ICOs shares with ETH.
I might of course be completely wrong but I would say less than 5% of the buyers actually believe in holding those for years as an investment!