I believe intrinsic motivation is good, and that's what we're better off "pursuing". But there is also something called "extrinsic motivation", it's a reward-driven behavior used *a lot* in the workplace--praise, fame, money, all are extrinsic motivation because they come from the external world. But extrinsic motivation are weak and can even be detrimental in the long run. Therefore, people who can find their intrinsic motivation--such as enthusiasm, "work engagement", and satisfaction--are the one who are more likely to stick around for long-term.
The rest of your arguments, I agree. Those toxic people must be weed out immediately.