They need to diversify
Apple, Google and Microsoft use their product to sell content and advertising. Selling just phones isn't going to get RIM any more market share no matter what they do.
I think they need to use their strength which in my opinion is QNX and make the high profit things that QNX runs like medical equipment, stop lights, satellites, industrial robots, etc. The may get a chance at the CANDU reactors depending on what happens in SNC Lavalin's criminal investigation. They should also make networking gear and get into hosted services like Amazon has.
I also think they should buy D-Wave and sink $1 billion of their stash into it. If for nothing else but to prove that their a forward looking company with potential.