If they want to make the NX a service like the Apple store, then having a framework based on android sort of makes sense! If they use an android base as their OS forever, then games from the next console will work on the new 2030 console!
That seems to be what they want to do, especially since the eshop is pretty barren. I could see most virtual console stuff being worked on in the background so that they're good forever under the new NX program. Wii virtual titles had to be reworked for Wii U and after Smash 3ds/Wii U I'm sure Nintendo doesn't want to waste resources doing stuff twice anymore.