We all oughta agree that WPVI; WABC and KABC's sister station is more the wild child , especially now in these circumstances haha.
They are most resistant to changing their identity especially their music, because of how strict their viewers are. The 6ABC identity has embodied themselves in Philadelphia culture. Philly locals literally love WPVI's identity to the point where the music itself has become the defacto anthem for the region. They tried to deviate from their iconic Move Closer to Your World Theme with a more orchestral modern format in 1996, which was extensively discussed here, and we all knew they had a lot of issues and backlash from the public so they quickly went back to their original theme within less than 24 hours so I don't see them really changing much when it comes to their on air branding and theme.
So there are unique times where the public gets involved and expresses their concerns greatly but this is not the case all the time. WPVI's theme, format, and presentation, arguably is the best in the business and has worked for them. Thats what I wish we could see more of for the rest of the O&O stations. An established brand and identity that really captures the region that they are serving in addition to retaining the overall O&O look which WPVI exemplifies. The Eyewitness News Dispatch (Series 4) theme to me is very New York and it should be exclusive to New York in the same way that Move Closer To Your World is Philly and should be exclusive to them, but I digress now haha.
Now, regarding WABC adopting "ABC 7" instead of "Channel 7". I guess they can do that, makes sense since they are known as "ABC 7 NY" for their digital platforms, so its only fitting for them to switch to "ABC 7" Eyewitness News, but its been widely discussed and understood that New Yorkers refer to the station as Channel 7 rather than ABC 7. In the same way WPVI says "Channel 6" instead of "Six-ABC". But time will tell, im really interested in seeing what KGO does.