I've talked to a bunch of other developers over the years about Android. There seems to be two basic issues:
1. As pointed out above, latency. You can't really do real-time music apps on Android, which is what CW has done for iOS. Sonoma Wire Works came up with a low latency solution, but apparently it was never adopted.
2. iOS is very standardized. There are many variants on the Android platform, so it's difficult to come up with universal solutions and QC them. I have an Android and there are tons of programs that simply won't work with my particular phone. If you look at reviews in Google Play, you'll see "Works with this phone," "Doesn't work with this phone, uninstalled," "Worked until recent update," etc.
I doubt Cakewalk would want to divert resources away from their core programs to get into that particular quagmire. That said, I do know they are aware of Android and following its progress. There are always rumors that a more real-time Android OS is "just around the corner," but I've been hearing that for a couple years.