You can't add security on top of an unsecure OS.
RIM could run Android in a VM and the BB infrastructure in another, signed VM, thus partitioning the unsecured from the secured and maintain compatibility.
I believe RIM could do it, but it will require some out-of-the-box thinking and courage on their part. I don't think they have many hands left at this point.
Being an android maker in a sea of android makers is not a place you want to be.
That may be true, but at this point, no one is picking up what RIM is putting down.
Most times it's better to swim with the school than to strike out on your own.
Because it's not like the market is saturated with Android phones or anything
Good point, but I believe a BB device, using an Android OS which incorporates RIM's back-end messaging and security features, would differentiate it's devices in the market.