The Umpires Association will definitely make a fuss about this even though it is ultimately better for them. No one will be able to question the result of a game due to balls and strikes anymore. Didn't think the calls were right, why didn't you challenge. Mismanaged your challenges and didn't have any left, too bad, that's the coaches fault.

But they will likely see it as a slippery slope to full robot umpiring.