I don't think he'll ever "quit" I think, like LDS said, he'll slow down and do features and then burst back on the scene. As far as their deal with Fontana they are contracted to do so many albums a year (I think it's 4 or 5) at the very least if he doesn't drop solo albums he will be featured. Plus the demand for Tech is skyrocketing as of late. I hope he never puts down the mic.