Just don't get the excitement
For some this will be just what they need. If you've got a pretty dumb lump of disk you need to stretch a bit more functionality out, then hell why not?
But Datacore have been selling this has an approach for years. Lefthand has probably been about the most successful of late. ONTAP Edge has never particular set the market on fire. These solutions all work well in maybe a remote environment where you say one or two fat servers with disk in are at a remote site, but for core DC platform? Some of the new ones, who knows, good luck to them, but in 2 years time will anything be fundamentally any different.
You can argue these appliances might worth in xSP environments and thats true to some extent. But you still need to manage the underlying physical disk pools and the VSA does not change where or how you do that.
A final puzzler as I see it - if was going to be so successful, why did the backers of ScaleIO sell it for relatively small price of $300m to EMC? $300m to the man in the street is a lot of cash - for EMC its probably what Tucci spends on his jet and 5-tassled loafers a year. Personally I think the ScaleIO backers realised it was going to be a very tough sell to the man in the street, even if it made great marketing copy and got out before they had to get it to market. I would point the same at XtremeIO to be fair...