Yup.
Let Yeo finish the year and fire him, Fletch and Lappy and start fresh.
This. Yeo is fine to finish out the string. May need to bring in a defensive guy with him though. Surprised Terry Murray isn't there yet.
After that though clean house and start fresh with a new GM and his own coaches. They are basically going into a multi-rebuild so now is the time to set up the org with a (hopefully) good mgmt group that can work as a cohesive unit at all levels.