Sure, so what? Anyone smart and dedicated enough to complete a Phd is smart enough to realize this going in. Surely the vast majority of people getting Phds don't expect to ever become academics and have some other plan.
> Anyone smart and dedicated enough to complete a Phd is smart enough to realize this going in.
No, this isn't true at all. People don't complete PhD's because they looked at their options and thought that one was the best. They do it because other people told them they should, and they just never thought about it.