Google isn't a monopoly in the Standard Oil sense of the term. Its ad revenue is big because it occupies so much user attention. I actually think many suggested remedies would actually make Google more profitable.
For example, prohibiting Apple-Style search deals would mean that Google gets a smaller amount of traffic, but that traffic would come with zero cost. That could end up being more profitable. A similar argument applies to Chrome or any other customer acquisition vehicle.
The real barriers to making Google competitive are fixable but require a different sort of regulation outside of antitrust.
For example, prohibiting Apple-Style search deals would mean that Google gets a smaller amount of traffic, but that traffic would come with zero cost. That could end up being more profitable. A similar argument applies to Chrome or any other customer acquisition vehicle.
The real barriers to making Google competitive are fixable but require a different sort of regulation outside of antitrust.