I always thought the point of 29ers was improved rolling, obviously with minor weight and handling penalties, to let people grind the miles out…
Nothing to do with rider height, surely the whole reason for different sized frames is to account for the differing shapes of various people.
I have no first hand experience of 29ers but I can see both potential benefits and draw backs, I think it's safe to say they suit a certain type of riding, just like any other bike is built with certain types of riding in mind, nothing wrong with that.
I could see myself possibly trying out a 29er in the future, but it all comes down to one thing for me; cost, they're still pretty niche (meaning expensive due to rarity) really. if I'm honest I don't fancy paying over the odds for a rigid SS bike simply because the wheels are a touch larger, I like my kicks cheap, in that respect 26" wins…
2010 the tear of 29ers? Nah, still a bit too niche I reckon, I think most current 29er owners would like them to stay niche, and I thinks most "Mainstream" non-29"-converts are probably "Niche averse" anyway…
Adoption by the masses takes time, and a smaller price tag.