If you leave the locomotives as they are, and don't repaint them, they will continue to deteriorate and railfans will complain about that.
It doesn't matter what they do. Railfans will find a reason to complain about it.
Of course the whole discussion is MOOT, because they are repainting them as heritage units.
The paint schemes do nothing with regards to public relations. Only railfans recognize them and what they represent. Railfans are far and few between, and do nothing for the company's bottom line. Your average Joe Everyday just sees an odd-colored flash as the head of the train hurtles through the crossing, while he curses the railroad for delaying him from his destination.