I think you'll see some folks stay with or go to turboprops on certain routes. The RJ's are affordable to operate, but with 35 to 50 seats the cost per available seat mile is very high. If you don't have a profitable load factor on a consistent basis, you would lose a bunch of money, even on a subsidised route. If you could get a fast and efficient turboprop like a Q400, then you can provide a sightly lower number of seats (which is fine if you weren't filling all 50 anyways), and lower your cost per available seat mile, therefore, load factor percentage increases and cost decreases, it's an ideal situation.
CJ