CRJ is quite a different matter. The market for them has taken an absolute nosedive. Bombardier gave up the production of them but are still left with the last ones made unused and unsold. The very large Indepencence Air fleet (80 plus) have been on the market for a year since their bankruptcy and are a huge drag on secondhand sales. I would think quite a number of the earlier CRJs have already done their last commercial flight.
And the same thing happened with many of the recent-generation turboprops the CRJs replaced.