Being completely sincere, if BoC tours in Scotland or anywhere else in the UK exclusively, I WILL be getting a passport and traveling over there. It's worth the money.
However, if BoC did a really large tour with 30 or more dates, there's a fair chance they may have one or two in the US/Canada, probably in NYC or Toronto, somethin' like that. It's not going to be their first stop, but considering a large chunk of their fanbase (at least, a large chunk of this website) is American, I wouldn't rule it out at all.
The main issue would be that they probably wouldn't do an international tour. If they decided to though, I think the US and Canada would pretty much definitely be on the list of countries.
Okay...now...wait for fog machine.