Dude, you're not right at all. There are a lot more opportunities for a PhD although there are many for a BA too. You don't have to be a physics professor if you get a PhD.
You could be a post-doc for 12 years until some professorship opens up in the Golan Heights. If you don't want to stay in Physics the only thing a Ph.D. is useful for is a "change career free card". You're allowed to change your career to anything but only once.