Adopt Mobile Device Management (MDM).
Want to get even closer to BES-like functionality? It's possible with Android. The big difference, though, is Android is an open platform that encourages third-party development; thus, you'll have some decisions to make, since several MDM vendors deliver BES-like control over Android, iPhones and other mobile devices.
With MDM in place, you can encrypt data in motion, remotely enforce application password policies, remotely wipe enterprise data off of handsets, partition corporate data and set role-based access rights.