There is a fantastic solo version out and I know that Eggertspiele and Steve, the designer, are now in contact. So if both sides want it to happen - a clear win-win situation - it will be included. (BGG forums, 18 February)
Image source: BGG
I really hope this will happen. I probably won't buy a second copy of the game for it, and keep using my PnP Garth. But it certainly would help me consider buying one of the future new variants, GWT Argentina and GWT New Zealand.