Not sure the big boys need to do that
I'm not so sure that the storage titans need to buy up the flash upstarts.
For example, Dell has Compellent, EMC has FAST, and IBM has SVC: all of these technologies do block-based tiering, and therefore integrate flash into storage arrays in affordable and effective fashion. NetApp is the odd man out here, with no such strategy, but that's intentional, I am told.
Granted, many of the new flash start ups are doing dedup to make the use of the flash effective, and none of the above vendors have dedup at fast enough rates for SAN. Still, I'm not sure that this is enough of a discriminator, to justify a buy, except perhaps to take the upstart off the market (which is illegal, but often done anyway).