If you look at it that way, which is sort of a wrong way to think of it, but... Airbus 320 is your safest fleet type for the next 50 years. The different low cost operators will come and go, wasting investors money while making the next executive team rich, but as a pilot you can really only strive to control your date of hire at a long term operator.

The Airbus 320 and 737 type ratings are the most versatile/valuable in the world if you wanna look at the type rating and fleet size as some sort of job security.

The CRJ and Embraer small series aircraft is out of production. Meaning the fleet will only dwindle down as airplanes are parked. The regionals don't have any job security by way of a large fleet/abundant operators.

Airbus 320neo series still have thousands of orders (8k?), most still to be built and delivered, and thousands of orders will be made in the future.

737max is similar, with thousands (5k?) to be built, but possibility that new orders will go to a new type.