Google has to do this, regardless of how the case goes, if only to show its customers that it values the veracity of the clicks from their ads.
Otherwise, if the distrust for true effectiveness of clickthroughs (it's top bread-and-butter) from Google's ads will circulate, that'll spell doom for the company.
It may be known as a "search" company, but its main source of revenue, its lifeblood, is the reach and effectiveness of its ads. Something they must guard with their life (so to speak). Once the reputation for that integrity is shattered, there won't be any compelling reason for people and companies to patronize them.