Judging by the output of the scientists I follow on YouTube because they also explain things for outsiders (and that I only subscribe to a few specific domains of science), at least dozens.
About once a century is all you need.
So, we only need science news one time in century. Kinda hard to develop proficiency at that rate.
No, we only need one massive paradigm shift per century, and then there are plenty of new productive areas again.
there is a lot of space between fields as it is hard enough to do one.