I’m on a bit of a Dragon Quest kick right now so I wouldn’t mind, but VII seems like the absolute strangest choice to remake. It wasn’t that long ago that the 3DS remake came out, which IMO was a fine remake all the way through (I’m ok with the shortened intro, having played through the first chunk of the PS1 original). I expect perhaps that version wouldn’t hold up to modern scrutiny even on Switch/Steam Deck-style handhelds, but it feels like the effort would be better spent on getting a game like VIII which did feel compromised a slight bit in its 3DS iteration, or IX which has never seen a rerelease since the DS, a more proper remake?
VII is notably the only current missing game from the pre-IX offerings on mobile. I don’t personally care for playing these games on mobile devices but I don’t know how much of an impact that market has.
The story demo was tiny compared to previous similar demos (Sky 1st, Ys X, DB 1), but given just how generous those previous demos were, and how this game isn’t really the opener for this arc, just showing off a tiny bit of gameplay + enough story to situate the game is likely fine.