I would have no problem paying somewhere in the 300/400 range. If it got to the 500 and 700 price range than I would probably pass but it would still be cool to see them made. I remember that Bob said he was considering doing a Ceder top in Wood & Steel. Although the marketing has been great for the GS Mini I don't think it is really a "travel" guitar. It is a modern day parlor guitar and IMO sounds good as many twice the price.
Given that the GS Mini has been sold for a couple years now, at the price it has been, how many other people do you think would be willing to pay more than twice as much for an all solid version?
I don't believe it would be anywhere near a big enough number for Taylor to ever consider doing it.
Had the GS Mini been introduced as an American made, all solid wood instrument, it could fetch a 300 Series price. But, since it's been available at such a comparably low price, it wouldn't.
As Brian Swerdfeger used to say: "We would sell tens of them".