Yeah I doubt it is 'set in stone'... at least not to the extent of requiring exactly that ratio. It has been roughly that (65:35, 60:40, 55:45, etc.) for a number of years though, and again, I would think such a ratio would have to be more or less determined from a relatively early stage (i.e. by the time the initial class list is submitted). Obviously the earliest acceptances are mostly IS, especially from EDP, but surely by the end of March they must roughly have a 60:40 target well established.
You're right though too, this setup would somewhat 'favor' OOS students at the end of the cycle - in that they would account for the majority of the wait list movement. However, being an IS applicant in WV is statistically one of the best states to be from (
https://www.aamc.org/download/321466/data/2012factstable5.pdf), so IS still have it pretty good
🙂 I reckon there are essentially separate wait lists for both IS and OOS candidates, and that these can be dipped in to as needed.
The vast majority of IS accepted students in WV will keep their acceptance though and matriculate in state (notice in the link above... WV has the lowest - tied with SC - number of IS applicants that matriculate out of state) - so there is no need to really have a deep wait list for IS. The OOS wait list, on the other hand, seems to get quite large (250+).
Anyway... just speculating and mulling things over as I'm tired of waiting!