Start demanding competence once again and the rest fixes itself.
Basically what you want to do is take all the new or relatively new people in the industry and tell them to stop everything. Then you get them to start practicing the very basics, sand bags falling, bouncing balls, basic anatomy, proportionality, walking cycles and so on. Every now and then you bring in an old-time pro, one of the old masters of the craft to give some advice and give some guidance. Along with the practice you make a backlog of things they need to watch: the best and the worst the medium has to offer, not just in terms of animation but also in delivery, writing and character development, so they can build some perspective.
Finally, once they've mastered the basics and re-developed a better understanding of what makes a show entertaining and good, you show them other styles of animation, be it anime/manga, those Russian cartoons from the cold war, indie french stuff, etc..., not so they can copy it, but so they can see how many different styles there are and how it doesn't all need to follow the same pattern to be popular. Once again, the objective is to build perspective.
The reason for all this is that if you allow people to delve into abstraction without even mastering the basics, they'll often start using abstraction and fluidity as an excuse for laziness and progressiveness as an excuse for bad writing. With a deeper understanding of the fundamentals, they can approach abstract or unique concepts with more maturity and thus deliver better shows>tl;dr: you kill them all and rebuild anew.