Firmware series 6.x.y IS Android.
Two points, that if I where making the product change decision:
1) Amazon/Linux is much more secure than Google/Linux (Android) - everybody alive can root Android
2) Only the newest Oasis has the hardware resources to run Android in a reasonable manner.
(The Chinese Android for the Paperwhite and others is only "bragging rights" - not really practical)
With J. Bezo's strong feelings against after-market add-ins and being able to keep control of their e-book readers, I would say that (1) would be the decision point to not change to the less secure system.
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