Great question ClydeFrog! Currently there are six free Dead Halt Adventure Arcs in the Winternet Collection, two more only avaliable on Floppy Disk, as well as a big print book of adventures (5 are contained along with a bunch of floor designs) called Happy New Year 1999 coming out very shortly.
I think you are worried that I, like most, create a game and then move onto a new one. For some reason I am stuck in the Hotel, I love it so much. There will be lots of content coming out for Dead Halt over the coming years, it will never truly be finished I don't believe.
I am planning another game at the moment, but it will be fully compatible with Dead Halt... more of a, "End Game Content" sort of thing. Even when that comes out, Dead Halt will continue, as they will stand hand in hand.
Enjoy your time in the Hotel!