I'm betting that the deluxe set won't ever end up remaindered, but it's possible the cd by itself could. The cd would be a seller as a solo item with different packaging, to make it appeal more to the old-timey/vintage jazz & blues crowd instead of the more limited magical audience. Well, it might sell anyway as it is... people know him from Deadwood and the Mamet films, who knows?
I like the cd, but that kind of music is already my cup of tea. It is a perfect soundtrack for a home poker game, that's certain.
The deluxe set is definitely where it's at though, it's incredibly fun if you're an aficionado of Mr. Jay's work.
But you're all probably right about the limited appeal. The deluxe set might come and go and never be there again. I'd grab it now before there ain't no more to grab... if you got the interest.