Why doesn’t SanDisk make a Fuse-Android? If they made a 4.0" screen 16/32 gig memory with an XC expansion slot that ran an android o/s and worked similar to the galaxy, I would buy it in an instant. One thing, make sure it has plenty or processing power and RAM so that it can run the apps smoothly.
There hardware has been based around a similar family of ARM9E chips for several years now. These are not sufficiently powerful to run something like Android, so I think they’ve preferred to stay with their simpler internal OS. However, I think in the long term, most portable embedded products like the Sansas will go Android as their hardware becomes more powerful.