So the article mentions that there will be work done on the ride system. Here is an excellent video that explains, accurately and very, very in depth, why Expedition Everest has such a crazy ride control system and offers some insight on why they might be addressing it.
(Great channel for coaster fans, by the way)
Summary: Basically, Expedition Everest was designed to run 4 trains at once, but has been modified to run 5 since 2007-ish for higher capacity. It can do this entirely safely as it has more than enough block zones for it. However, with 5 trains, this only allows for mere seconds of delay at load or unload before the ride goes into what's known as a "cascade stop", where the ride initiates an auto ride stop from trains being unable to advance to the next block zone. Part of this is because, to avoid the trains constantly slamming to a stop right before the yeti animatronic scene, the ride system is told to hold the train at the shadow projection until the vehicle at unload advances to load. Holding the trains longer at the shadow projection is better since they are already stopped at that point anyway. This programming results in the control room operator constantly resetting these auto ride stops, as the ride control system is not capable of auto-resuming ride motion after one has been triggered. So, it's possible that this is being addressed.
He said something about how the yeti is a very complex machine, but was mostly beating around the bush for PR reasons. Marni is correct: both that the yeti figure has been removed on at least one occasion, and that the only reason a fix or replacement hasn't been done is because it was deemed unnecessary as Everest never lost its popularity. The B-mode strobe light fix was supposed to be used sparingly but ended up becoming the permanent solution ONLY because they never wanted to spring for a fix or take the capacity hit from shutting Everest down (though the quick removal of the figure suggests that a replacement wouldn't necessarily require significant downtime, if any).
Bingo! The designers and engineers would had to have been unfathomably stupid to design such an expensive piece of equipment but not give themselves an easy way to work on it!