I agree. And this (along with issues like board play in the d-zone and along the blue line, transition play, and giving/receiving passes) is the reason why the management group for our 2010 and 2014 Olympic teams were so adamant about bringing a balanced group of defencemen w/r/t handedness. For 2014 in particular, on the wider international ice surface, the issue you pointed out and the ability to give and receive passes on your backhand were a point of concern for the management team and Babcock, and rightfully so.
And these are Olympic-caliber professionals we're talking about, not 18 and 19 year olds who presumably have little or no experience playing on their off-side. The lack of any RHS defencemen on our World Junior team is a cause for concern. The Thompson issue is unfortunate (he was good enough to make the team imo), but with the expanded roster size this year I don't understand why they wouldn't bring Iorio at least as a 7th/8th defencemen in the event one of these guys struggles. It sounds like Cameron is aware of the issue, and thinks it will resolve itself, but I can see this being an issue for Canada throughout this tournament. If I was in charge of picking the American team, I'd select as many physical, fast, hard forecheckers at left wing as possible in order to pressure the Canadian LHS defencemen on their off-side.