Continuous Growth and Continuous Improvement doesn't always mean leaving your current gig, but if that is what it takes, then hop away. For me personally, in the last 4 years I have been in 4 different companies. I had one job offer that asked whether bringing me on meant that I would be leaving after a year or two, I declined the offer because it was not enough to make me want to leave the employer I was at. I feel that each one of my previous endeavors has lead me to the next opportunity.