I think this concern is being somewhat over stated. First, in any given base/category it is doubtful there will be a super high percentage of ULC lines. I mean I could see some hitting maybe 25% of reserve lines but not much more. And second they're going to be offered in highly overstaffed categories so really, how many super-senior guys would actually end up having to sit a SC if they had a standard reserve line? Not many if any, so the junior guys are still going to be doing their standard amount of SC's anyways.

This sort of reminds me how there was some angst among several pilots when SC went from 12 to 9 hours. Lots of people were afraid that it was going to lead to a dramatic increase in the number of SC assigned, but from what I can tell that really hasn't been the case.