I don't know that there is any reason to believe there will be no more acceptances. I know people are trying to lower their expectations as a safeguard, but even WUSTL has no idea whether there will need to be more acceptances or not. They still don't know exactly how many people will be sending in their $200 seat deposit, and they don't know how many of the people that do will be asking for their refundable deposit back.
Anyhow, people above median have fared pretty well off the waitlist. LSN shows that of the people that were WLed above median, few got WL-Rejected. The ones that didn't get admitted after being waitlisted eventually withdrew to go somewhere else instead of being rejected. If WUSTL is really your first choice, getting a WL and being above median might not be all that bad. Of course, this cycle is different from previous years. Applications are up slightly, and the prevalence of people with LSATs of 167+ has increased due to more people retaking the test. So who knows.