If the Olympics was 'unlucky', then maybe WEG 2010 was 'lucky.' You can't just take luck one way.
Did DOC build a program in Canada? The depth was lacking when he came in and I'm not sure it's much better now. I certainly don't think eventing as a sport is better off in Canada these days -- not that I'd attribute that to the coach but I'd be surprised to learn there's a healthy pipeline of developing riders in Canada.
And with the level of dysfunction in Canadian horse sport orgs, I'm not sure there's much any coach could do about the situation.