Right now in my province, unvaccinated individuals make up 11.2% of 12+ population but more than 66% of hospitalizations. I don't expect the ICU rates to be more favourable to the unvaccianted than total hospitalization rates. If there is a point of rapid diminishing returns, it is not at ~90% yet.
https://www.alberta.ca/stats/covid-19-alberta-statistics.htm...