Don't quit! I'd rather have good, honest people working at Google, instead of them quitting Google. What would Google be like if no good people worked there?
You are assuming a correlation between technical competency and moral competency that I've never observed history guarantees.
Can it get worse? Because it looks like whatever good guys are left don't have a voice anymore.
Yikes... I can't believe you even typed that... inviting it to happen.
It can always get worse. There's always whistle-blowing, which would stop if all the good people left.