i had that concern too. if it existed i'd have my heart set on a racelight, sakura/kamui version of the surface, because i could see the weight and capability of an am 29er chromag being pretty similar to my 6" bike. one of the reasons i'm not totally gutted not to have bought one in the fall
Did you ever think of a sakura/kamui with 650b wheels? 26" wheels with long travel fork for whistler/shore and 650b wheels with short travel fork for xc/trail stuff. Two bikes in one and all the numbers work pretty much perfectly. In my eyes that's still the ultimate hardtail bike for these parts.