But the big difference is that Envoy has multiple airplane types. They have gotten rid of a lot of 700s, and they've replaced them with E175s. PSA doesn't have another aircraft in their fleet that will allow them to cover retirements and/or growth. I know it's not going to be quick, but the CRJ's days are numbered.
And there are a lot of 700's that aren't ADS-B compliant. PSA may be able to scoop some up, but they are going to have to pay for and coordinate all those modifications.