Add me to the list that thinks the D25 and D35 should make a comeback. IMO, as it is they are playing to the well-established high end market without a lot of marketing or brand awareness. I don't think Guitar Center/MF really carried any Guild stuff, did they? I never saw any in GC around here. The girl that worked there when I bought my D25 said she thought they were cool, but they never got any besides occasional used stuff. I think in a lot of towns, the GC/MF Wal-Mart format means that they will be one of the few places that sell upper-end stuff IME.
So, forgetting the lack of actual guitars to buy, consider what people will be comparing to; stuff like the Martin D-28, etc. Everyone on the planet knows what those are, and everyone loves them. But hey, check out this Guild over here for the same price! Or don't, because why would you? I think that's a large part of the problem. I picked up a beat to hell flatback D25 years ago in a music store and thought it was the best sounding guitar I'd ever picked up/heard; as a result of that, I sought out Guild stuff later on. Much like that original guitar, I've really liked the ones I've picked up since then, and I absolutely love the archback D25 I ended up with. I'd say that if I was buying a new high-end guitar that the NH Guild stuff would certainly have been a contender, because my past experience with the brand has been great.
But, if you're just a guy on the street who's never picked one up before, why would you feel compelled to? The D-28 is considered to be a kind of ultimate acoustic guitar by many, so why go through the trouble to pay the same amount for an "imitation"? We all are here because we like them, but in this day and age Guild isn't a household name; Martin (etc.) is, and many tout them as being the best. So, why seek out something else?
That's why I think the lower end models would be a good idea. The market for cheaper US-built guitars seems pretty good right now, and at that lower price point I think you'd get a lot more guitars in stores, and a lot more people trying them out and buying them as a result. (The GAD series seems to have garnered a little mainstream interest even just being another made in China guitar.) Then, once you've started selling those and re-established the brand a little, you'd probably also have much better luck selling the higher end models. That's my thought, anyway.
(BTW, I apologize in advance for spelling/thinking errors contained in this rambling post.)