Missing the point
There are a few incorrect conclusions drawn here. Moving to BES will not solve anybody's issues. Neither will they be solved by moving to another MDM solution. In this instance, someone obtained administrator credentials, presumably by exploiting the Heartbleed vulnerability. Using the admin credentials, they then accessed the MobileIron server and sent messages and wiped devices.
Let's say for a second that BES had been in place. Hacker obtains admin credentials, and wipes devices. No difference. The problem is the leaking of admin credentials, which were not obtained through the MobileIron system, just used to access it. If the hacker had used the same credentials to delete/reset the mail server, would this article having been blaming Exchange? It seems that the company didn't patch servers for heartbleed, and got hacked, MobileIron was just a tool on the network that got used, but the failure to secure servers is actually the problem here, and replacing MobileIron will do nothing to resolve that.