A PhD is about you. Not about your environment. Not about others. Not even about your work. It's about you. What story do you want to tell to your future employers? That you were fed up with your environment and unmotivated to continue? Hell no! You want to tell you a tricky problem, analyzed it thoroughly and fuckin' fixed it! You got funky publications, an interesting network, a smashing thesis (no one's gonna check) and now are ready to take on the world!