Advice: Should you get your PhD?

Lots of good advice and insight. I can add this: a PhD (in physics, at least) generally allows you an opportunity to work on more interesting problems. As Ethan notes, glory and money are not usually the outcome of the degree. One should also note that you still spend 80% (or more) of the time doing mundane things. It’s the remaining 20% that has to be worthwhile to you.