Well, a mate in my LBS rides one a lot around Bath, the Forest of Dean, Black Mountains, Beacons, Afan…
In one week recently five 29ers went out the door. I guess it all depends where you live, and, probably more importantly, whether the LBS has staff who actually ride the bikes they sell, understand how the differences affect the way a bike can be ridden, and can communicate it to the punters. My mate rides lots of bikes, several times a week, and he knows and understands that, and will take prospective customers out for rides to show them. He's also very enthusiastic about the GF Roscoe. Do I think 26ers will die out? No, I think 29ers will get more popular, but for a great many people the smaller wheels will just be more manageable. The best compromise is the 650b, you get the better rolling ability over roots and rocks, with a lighter wheel that steers more quickly. All we need is a wider range of tyres to allow more varied terrain to be tackled. I'm seriously considering putting together a 29er, but with 650b wheels. When I were but a lad, my first grown-up bike had 650b wheels. Only they weren't called that. You went into a bike shop and asked for a 27 1/2" tyre. Every adult bike had that size wheel, so using a 650b wheel is re-introducing the traditional wheel size to this country, in place of the American interloper. 😯