BlackBerry’s decision to remain in the handset market, despite failing to turn a profit for years and having lost almost all of its market share, could be seen as either denial or perseverance, but whatever it is, the company may have finally run out of it. At a conference in California yesterday, CEO John Chen said that it’s very possible that his company will exit the handset market if it can’t turn a profit next year, something that he’s hinted at previously.