The notch holds more than just the camera. The included VCSEL (along with the IR detector) that allows iPhone to blast a face with a matrix of IR dots, create from that a depth map, and use that for FaceID authentication, is not something any shipping Android has.
Apple also tends to take its iPhone cameras quite seriously. I have a hard time imagining they would be willing to sacrifice performance (low-light noise, artifacts, etc.) just to embed the camera under the screen, and as @Shamino points out, under screen cameras in shipping Androids have all displayed those problems.
The one thing I could definitely see them do is remove the speaker form the notch. And from all the rumors I’ve seen, that is one of the things they might actually do in iPhone 13, putting it into the frame instead and thereby reducing the notch in width.