As long as there's a possibility of making more money by lying and cheating, people will lie and cheat. Especially when it's a lot more money. But I don't think there's any unemployment danger among CS PhD's to worry about. Unless they somehow managed to avoid learning how to use any tools or technologies of value to anyone. PhD's do not have to be at academia or a "top job" to be employed in a research or at least R&D capacity.

By the way, tenured positions do not pay eye-watering salaries. It's still the same vicious low stakes.