I am not nearly as sure as you.
I don't see great development from Savannah Easton, whom I believe to be 14, but she's got time. She's young and skilled, but Siming Chen won the China Open at 17, Lorre Jon Jones was world champion at 15 and Jean Balukas was world champion at 13. Han Yu won the All-Japan, a major, by age 17. Jasmin Ouschan won the gold medal at the World Games at age 19. On the men's side, both Gorst and Filler won World 9ball championships as teenagers.
In short, those that go on to be generational players nearly always show it when they are in their teens. For me to believe that either of these two young Americans will be one of the most elite, I'll need to see them win a major international championship (World 8ball, World 9ball, World 10ball, or China Open) in the next few years.
I'm impressed by performance more than I'll ever be impressed by potential, so I'll keep my eyes open and see what kind of performances the two young Americans are able to produce. Wishing both of them every possible success. I'm rooting for them to succeed!