Wise decision. Even Samsung sees dwindling profits from Ad-droid, there's no money in this, Nokia don't need a loss making division.
Nokia just bought Alcatel Lucent for about $16 billion. They don't have the money to buy Blackberry.
Unfortunately, the ACL acquisition is a mistake in my opinion. That deal will not be worth it and eat Nokia finances instead.
Smart move they'll probably turn into another Sony, HTC or Blackberry loss machine if they enter the market right now.
Nokia should buy Blackberry, with BB OS and servers, Here maps and Nokia design they can build a desirable smartphone