I think there need to be a intermediate point. It's interesting to have the point of view of new developers, with all the new stuff and a lot of enthusiasm to make thins faster and maintainable.
But the old developers have the view of years of experience and maybe not have a lot of knowledge about the new stuff, the interesting point it's to have the nice knowledge of the old developers and transmite to the new developers, and viceversa with the new stuff of the new developers and new technologies and techniques make the old upgrade their skills.