It's a tough one there.. I think Yallop has been allright overall. His player selection has been less mysterious than Holger and Bobby. He has given almost everyone a chance unlike Holger who seemed quite biased in his selections.
But I also see where you are coming from. If you fail, you usually don't continue. And theoretically, that should be the case here. You could however argue that he hasn't had enough time (i.e. for 3 of the 4 years leading to this World Cup, Holger was the coach).
But don't count on people like Bora...He mentioned once that he was not interested in Canada because of its overall climate, both weatherwise and soccerwise.
It's the same double edged sword again...foreign coaches can't get used to Canadian soccer and Canadian coaches aren't experienced enough to lead a successful enterprise.
However, before coaching I would look at the following first:
* Ways to improve our preparations. We can not continue to have no preparations prior to crucial world cup qualifiers.
* Ways to improve the professional scene. If it means MLS, then so be it. It's not my first choice, but if that is the only option, we have to take it. I know it's not the prettiest but if we can have 20 guys who play together for 6-8 months of the year at a reasonable level and we have access to them without forcing them to fly 11 connecting flights, our qualifying chances will be better.
Once we have the infrastructure, we can land the best coaches.