As I said before, I honestly don't think I'd care if they never finish Ridley's prequel series. Both individually and collectively, the two films feel like the messy result of a confused, directionless development process - you can really tell from watching them that the goalposts kept moving throughout both productions, to the detriment of the final product, and I'm not convinced anyone has any real idea where it's supposed to be going next. I don't enjoy either movie and at this point I couldn't really care less what David gets up to down the line.
That said, I get that people who are invested would be understandably gutted that they might not get closure.
As for a potential reboot/remake, to be honest, if it looks decent from the trailers, I'd go see it. The series hasn't produced a really good film in decades, so at this point I don't see what harm attempting a fresh start can do. That said, if they're gonna hit the reboot button, I'd prefer them to simply cut their losses and start from scratch as opposed to messing about keeping some of the films and not others.
Ideally, I'd rather they just did some new, unconnected Alien stories set in the same universe.