Having sounded upbeat about BlackBerry’s prospects at Mobile World Congress last week, new CEO John Chen was far more circumspect ‘ or perhaps realistic ‘ in an interview with the Financial Times newspaper. He said the turnaround plans have a ’50:50 chance’ of success. However, he seems to think these are reasonable odds, given the track record of difficult reorganizations he has witnessed during his long career in the IT industry. “I think when you look at turnaround history in the technology market — although there is not a lot — but not too long ago IBM went through it, and not too long ago Apple went through it. I think this is really about catching the technology market wave.…