I've actually experienced a rebranding effort with an employer before. Takes time and effort. Beyond the cynicism and snark implying otherwise, there's good enough evidence to suggest this actually happened and really wasn't just an executive deciding things on a whim.
KYW-TV is a substantial rebuild project for CBS. The station had years of poor management and worse executive oversight at the top. EWN had deeply negative connotations in the Philadelphia market, with disadvantaged communities considering it racist. Those are not in dispute and have been documented on. Of course ownership will want the local people to have a say in the rebuild, to suggest otherwise is pure folly.