Yeeeh, A7R's aren't A-Mounts 
Lets not forget who Sony are, they're a massive company with divisions that still make money, plus have a lot of money in the bank (recently bought a $644 million stake in Olympus). They're going through a transition period of selling off branches that aren't profitable or never will be (you can never compete against cheap TV's from China). This isn't some hollow American company like Enron, or trade on toxic stock like Lehman Brothers (I suppose you could throw the whole American banking sector in there aswell), or unable to change with the times and need a Government handout like GM, they'll be here for a long time and will be profitable as a company again - probably soon.
And the guys that think Sony will sell their image division to Canon must have rocks in their heads, IF, and that's a big "IF" they did sell it, Nikon would have first preference as they use their sensors, then probably Pentax as they do the same, if neither of them want it I'm sure Samsung would snap it up in a heartbeat, even Apple would probably look at it (as every IPhone camera is a Sony). Canon would be WAAAAAY down the list, so they'd still be in the same boat as they are now.



