[poetically]

Innovation hasn't slowed down. Individuals are just having fewer effective ideas. This is expected. The contemporary world is a complicated place so any kind of real innovation requires coordination among large groups of specialists. The development of the vaccine is a very good example of real innovation because it demonstrates what specialists can accomplish when they effectively cooperate across commercial and governmental institutional boundaries.

So if something is slowing down innovation it is probably the incorrect emphasis on the lone genius focusing on hard problems. This is no longer a sensible model for innovation and it probably never was in the first place.