Best advice I can give is, at the very least, get a feel for the market. Apply and go to interviews and see how things feel.

I have been in a not too dissimilar position over the past couple of years. I enjoyed working where I was at, but certain restrictions and limitations urged me to look elsewhere. Don't get me wrong, I worked with a fantastic team, and in a well oiled machine with lots of very smart devoted people. I'd be lying if I said I didn't wish I was back there, but if you have the desire to learn, you need to take action.

Hopefully that helps ease your mind a little, and good luck.