Thinking about leaving my PhD, thoughts?
It's good that you're thinking about this now, but unfortunately, only you know what you want with your life.

You've given a nice list of pros and cons of continuing to study. Let's summarize:

Work now


Longer work hours
Secure job
Better pay, or at least not worse than a future PhD graduate
Not exactly what you love doing


Keep studying


I love physics!
Nomadic lifestyle
No guarantee of job


One thing you didn't mention is whether you have a significant other. Nomadic lifestyles are bad if you intend to settle down, start a family, etc.

If you look at all this there's really only one thing that's in favour of "keep studying": your passion for physics. Is your passion for physics so great that you're willing to risk everything else for the chance to pursue an academic career? Unfortunately, only you will know the answer to this question.

Here're two things you can think of doing:


Keep studying, but emphasize picking up skills that are wanted in the industry in the event that you can't get an academic job. Look at the jobs available for physics graduates in your area, see what the requirements are, and make it a point to learn them during the PhD as a fallback plan.
Work for a few years, with the intention to go back to studying after having secured yourself financially.


Ultimately, only you can answer this question.