Yep aren't Yulia & Anna attending college? Seem to recall them posting pix on Periscope when entering uni...By the way, even if they don't attend a regular school, they still have to study and take exams too, like everyone else. Evgenia, Elena, Anna, etc. all talk about this in their interviews.
Actually, I think the Japanese have a more crowded pipeline of senior GP-level talent than the Russians for 2018 and 2019 -- currently they have 8 skaters on 2 GP assignments each who should all still be active for the next year, and there is the prospect of 4 more new seniors next season: Marin, Yuna Shiraiwa, Rin Nitaya, and Kaori Sakamoto. Out of these 12 skaters, IIRC there are 4 (Mao, Satoko, Rika Hongo, Kanako) who have scored in the high 190s to 200+ points and 5 more who have scored above 180 (Wakaba, Mai, Kaori, Yuna, Marin). Then the following year there will be Rika Kihira & Mako Yamashita, both of whom have already scored 180+ to 190+ and beaten the current crop of Russian girls in JGP. Even if Mao and Kanako retire post-Olympics, they have 16 spots vs. potentially 12 qualifying skaters in 2019. And all the girls who hit their peak at age 17-18 should still be pretty stable into their early 20's as their jumps would already have survived puberty by then.
The Russians, on the other hand, have a tsunami of talent every year but it ends up being self-selecting by the time the girls reach the age threshold to turn senior, as some of the skaters who blossomed pre-puberty end up struggling after it. Out of the 9 skaters who have / had GP assignments this year, 3 are struggling (Artemieva, Leonova and Sima). There shouldn't be more than 3 girls rising from juniors next year (Tsurskaya, Fedichkina and maybe Konstantinova) so they will still be on 16 spots to 9 skaters, which is less crowded than Japan.