A reliable little birdie has mentioned that City and/or Rogers are perhaps the obstacle to the return of a new Blood Ties season. Say it isn't so! CITY, you have historically been the one to take on the new and exciting shows and types of shows when no one else would. You built your success on just that and when you have this gold mine in your hands you turn your backs?? I smell a Ted Rogers here! And if thats the case its all about money. And if thats the case here's the solution: 
Take on another season, promote it because you didn't do so last season, and the already very large fan base and the resulting revenues will be large enough to satisfy even our man Ted!
This is a great show. Its well conceived, well written, and beautifully acted by this amazing cast. Its Canadian too. Just think of the support you would be lending to the Canadian television industry for crying out loud! Here's the perfect chance for someone to step up and help to develop what could be a great industry here. Lord knows we have the talent. And CBC already has the market for assassinating all things Canadian; well all things that wouldn't put you to sleep anyway!
Oh, BTW: I have provided this link to some of my "friends" who also love this show...I hope you have lots of staff. You're gonna need it! 