I tend to agree that a dual boot system is pointless on a box, it is a case of one or the other.
IMO a combined system would be better, where your able to launch android apps directly from e2 and return back to e2 when done using it.
I think you mean like we run Android apps on a Windows OS. This is very resource intensive and would not be possible on a decoder. Remember Android is linux based ie advanced E2.