I'd say there is a very high probability that Michael Slagowski will run 1:46 and/or 3:55-56 soon, assuming he has competition in final half of each respective race. He's only 1/3s away from 147xx. Running solo likely won't get him there in either distance.
Vids here show he is a serious and untested talent. I haven't seen a runner like this in a while.
https://www.youtube.com/playlist?list=PLHL9EVF7E9NQ9EfBvw-Zf84v7rN0lvf8Y