I think it's clear that we will witness prep sub-four performances on an annual or semi-annual basis from this point forward.
The bar has been irrevocably raised. Eventually, the 4:20 miler will cede his D1 roster slot to the 4:10 miler; the 4:10 miler will cede his scholarship to the 4:00 miler.
Both mediocrity and excellence will accelerate. Enter the uber-milers.
I hope you are right but two things to consider:
1) they said the same thing about milers back in the late 60s
2) this Reed Brown kid seems like a huge talent and what he did is still incredible even though we've seen it a few times the last few year. His bar is just as high as Fishers/Slags/etc