IMO the perceived movement away from MTB to road is a symptom of the cycle industry shooting themselves in the foot with the needless attempts to foist two wheel size standards on consumers in an established market for the sake of change when 26″ works perfectly well. Given the choice of buying into a wheel standard that may well be transitory or a set of settled road bike standards, why would anyone take the risk of making the wrong choice?
I predict a backlash against it all within the next couple of years with a resurgence of high end 26″ bikes and components. If not, then the industry will end up throttling the goose that has laid it so many golden eggs over the last thirty years.
And no, I’m not expecting to see 900c road wheels appearing…