At this point, it's probably too late to adopt Android. It'd probably take as long or longer to come out with an Android OS (with all their apps) as it would to just finish BB10 now.
RIM has over 1B cash, has about 16,500 (soon 11,500) employees. Most of their loss was from writedowns, so their burn rate might not be too bad. They might have time to switch to Android. They can't afford BB10 to flop, but I'm pretty sure it will (even if it's actually a great OS).
If they can loose some heads, and switch to Android, they might generate some confidence which could help them get funding. An Android phone with a competitive advantage (in some niches) over Samsung is something I'd bet on. A phone with a new OS in 2013 is not.
The people left over will not be willing to bust their asses to make great products for 2013, even if they're capable of doing so. They will be exercising their skills at printing résumés. What is RIM going to do: give them raises, while they're losing money? More like their Office Space bosses will tell them how greeaaaaaat it would be for them to start coming in on Saturdays. No, RIM has lost whatever chance it had to try something new. The next series of moves will all be drastic and they'll have only golden parachutes in mind.
People prefer software that has existed for several years to software that might never be released. This isn't psychological, it's the same reason cats are a more popular pet than unicorns.
There seems to be this massive appetite right now for stock Android devices because of the pretty woeful update policies of the OEMs.
It just seems like RIM would have a lot of success having a stock Android + the fancy BB10 keyboard. And then gradually drip feeding new BB only apps.