I find it humorous that you insist that you can't find what's missing from NTAP's native 'complete solution set', yet there's obviously a reason why NTAP sells QTM technology.
I also find humor in your belief that EMC wouldn't care if NTAP acquired QTM technology and intellectual property, because EMC bought DD what is now a very long time ago, and absorbed it into an environment of bureaucratic, customer-distant, painfully-slow innovation compared to a more nimble company like QTM. I guess I give EMC management more credit about not being satisfied with their aging-horse acquisitions. And, even if EMC doesn't really need QTM, its no secret that acquisitions can be for defensive or competitor-stifling reasons.
(As for FalconStor, please. That's an invalid comparison. Everyone on the street knows the reasons that NTAP dropped them.)
I will agree that NTAP hasn't bought QTM because they haven't come up with enough justification for it. But, if they sleep too long, they'll be in for a rude awakening.