Except for the minor problem that any IP generated through their work is owned by the university. And if the IP's valuable, it typically flows straight into the hands of Flagship, Polaris, Third Rock, & co. The professor might have a say in what happens to the IP, but the students and postdocs have zero leverage with the TTO. And how could they? They are replaceable cogs in the machine (and often in the US on a student/work visa) - Bob Langer is not.