I really wish they would keep the Pratt 757 aircraft so these routes can have an adequate aircraft flying them. If they want more used aircraft, they have some with a united paintjob already on them available immediately!
Plus they can accelerate 50 seat RJ parking so the regionals are able to staff the flying they already have and won't be canceling flights left and right due to lack of crews. This summer will most likely be a mess for those guys.
All that is left is to upgrade the cockpits of all 757-200/757-300/767-300 aircraft to the 764 cockpit and a very standardized fleet has just been created.