To my knowledge there were plans in place to fix him without needing downtime that were never approved.
From what I understood it was approved which is why it was covered up for a couple of days last year, and they were trying to bring back some sort of partial movment until they bring the ride down to fix it completely, but the partial movement still put too much strain on the foundation which is why it was scrapped.
When it comes to the ride itself, yes it sucks that the Yeti doesn't move, but it still doesn't take away the fact that this is a fun as heck ride.