To add to what everyone else said, the company has created vacancies on MCO 320 almost equal to the amount being displaced from MCO 190 to help absorb most of the peeps. Of course, someone senior in JFK/BOS can snatch it too since it's a vacancy, if they so choose. So flights will be upgauged to 320 in MCO, leaving MCO with a similar base size.

There will be more 190 displacement bids in the future too for BOS and JFK as we fully park the 190s and more A220s come online.