I don't know how much abuse 29ers can take – I'd be interested to see how bikes like the Banshee Paradox get on in the real world. However I think you are a bit out of touch with what many people are getting up to on their mountain bikes these days. There's also the random factor that comes with trying new stuff. I've never done any jumps or drops over a few feet in height, but that's quite enough to bust spokes or trash hubs on a 26" wheel if you don't get it right.
Is the point you're making about the frames or the wheels not being up to it, as you seem to be saying both? Only askin'
I would think both are designed with the real world in mind, and as such would stand up to the same kind of 'abuse' a 26er would. Of course you pick your weapon for the intentioned terrain