I took this route as a tourist back in 2007 on the way up north to Labrador.
Pictures here: http://sniederer.k-i-s.ch/2007.06/pages/image197.html
I hope they bring back the route somehow, because it saved us quite some driving.
I'm sure it is a dificult route but maybe they cancombine the route from Digby to Saint John and the Yarmouth - Bar Harbour run with one High Speed Vessel. I could imagine, with a good timetable, it could be provitable. (Maybe include Boston - Yarmouth...)
We'll see... ;-)