Some very interesting points raised. When ringing around trying to track down a 26" Stumpy, the 'hard sell' on the 29ers was out of control. It almost felt like they had been given a script. But yes, if 26ers were really that deficient, why are so many people still looking for them and why did they sell out so fast?
The reason I prefer a 26" trail bike is because I also ride DH and want to spend time on something similar with a low BB, COG etc. My 09 Stumpy has a very similar 'feel' to my Demo and I like the idea that my bike skills can cross over between trail and DH riding. I'm not interested in riding fast up hills or on the flat and I no longer race, so I'd rather keep the 'fun' factor of a capable trail bike.
I would consider a 650b, but why re-invent the wheel (literally)? It's like skiing and snowboading - if you're really good at skiing and really enjoy it, why would you take up snowboarding?
As for Specialized, they've lost me as a customer in the trail bike market. I'll still buy their DH bikes though, unless they start making them all 650b or something...
If anyone has a 2012 Stumpy they want to sell to fund a 29er please let me know...