Oh, please.
It is inconceivable that there hasn't been a point in the last 2+ years when it wasn't "logical" or feasible to fix the thing.
$100 million bucks spent on an attraction 4 years ago, and they can't manage to keep even the majority of it's effects working. That is just sad, inexcusable, and completely non-Disney.
No other way to put it. The Yeti is broken and has been for nearly three years. The waterfalls never work at 100%. The bird very rarely puts in an appearance. The blowing snow on the peak never works. The mist in the caves has been turned off rather than being made to work properly. Steam from the engines is hit or miss. No excuse for any of that. Any suit at TDO that would try to put a positive spin on the situation, or try to rationalize why it hasn't been fixed....should be fired. They have no business working for Disney.