Long time mobile admin here, working for a sizeable law firm (one of the former BlackBerry's bread-and-butter markets)
We went from over 1000 OS7 devices (Bold, Torch, Curve and the like) in 2008/2009 to a current mix of 950+ iOS devices and 150 or so OS10 devices (Z10, Q10, Classic, Passport) devices today.
Priv is not even a factor in this mix, despite us being ready for it on day one by installing BES12 late last year and getting a pack of "Gold Premium - Android For Work" CALs.
Since Nov/Dec 2015 up until today (early June), we got exactly 6 requests to activate Priv. Six.
Four in the first couple of weeks after the release, two after Christmas. That's it.
Out of those 6, 3 users are now admitting they made a mistake (old school BlackBerry users who went from Bold 9900 to Q10/Classic, bought the Priv because it said "BlackBerry" on it, with no research into what they were getting themselves into)
They are now looking into either going back to Classic/Passport (while it's still available) or kicking the tires on the iPhone 6.
The remaining 150 BB10 users are basically waiting for their contracts to expire, then having no option to upgrade to new BB10 device (since they will be essentially EOL) the expectation is that pretty much all of them will move to iPhone.