Its not what I'd want in a personal phone - but for a company with people on the rode who need to check secure documents, central calendars, and corporate email there is a market for them.
That's kind of the problem, though. When a corporation issues someone a mobile phone, there's a certain desire and expectation that they're going to be carrying it pretty much all the time.
When that person owns a personal phone that they perceive as "better" than the Blackberry, they start to leave the BB in their jacket/in the car/at home/at the office more and more often, effectively undermining the reason it was issued in the first place. After all, who wants to carry two phones?
So yes, corporations would prefer that phones work a certain way, but they definitely would prefer that they have a presence on the phones their employees actually carry. There's a huge market there for whoever comes up with a feasible way to balance all that.