I don't think they have quotas, almost every season there has been 2 maritimes legs (except last season where the starting line was there + 1 leg, season 3 had 1 leg in NS and another one in Magdalen Islands, which is in Quebec but pretty maritime if you ask me)
They already almost skipped AB in season 2, only had the starting line there, so I think they could skip it also this year.