By Robert Cyran The author is a Reuters Breakingviews columnist. The opinions expressed are his own. Research In Motion doesn’t need to remain Canadian. The struggling BlackBerry maker is weighing its options, from joint ventures to a sale. Some officials seem to prefer to keep the once-feted company’s ownership north of the U.S. border. But despite form in the recent past, the possibility of a deal being blocked shouldn’t worry potential foreign buyers of RIM too much. The company’s declining sales and significance present a bigger challenge.