I know I'm going to get attacked for this comment, but I'll say it anyway.
First of all, I applaud WDI for putting in the money and effort to make a high-tech animatronic like the Yeti, regardless of it's reliability. They could have easily designed Everest with a permanent "B" mode, and none of us would know any different.
With that said, I always thought the Yeti's cost and technology was wasted, based on how it is used in the ride.
You travel past the Yeti WAY too fast to appreciate what it does.
It would be like putting the new DL Abe Lincoln along the tracks of Space Mountain. Sure, the technology is amazing, but you're whizzing by too fast to notice the subtle movements.
Think of the mining town on BTMRR. Riders do not notice how low-tech those animatronics are, because the trains travel by so fast. But at least the mining town can also be viewed from the railroad. The Yeti doesn't even have a secondary viewing spot to be appreciated.
I am certain that WDI intentionally designed the coaster to travel past the Yeti at that speed, with that extremely brief encounter. Using computer models prior to the ride's construction, WDI had every opportunity to preview the fly-by, and then either slow the track or re-design the approach to the Yeti.
I'm sure there are some that justify the split-second Yeti sighting as a storytelling technique (kind of like the way Spielberg kept the shark hidden in the original Jaws to build suspense).
I'm not debating whether the Yeti should be seen in a blink, or something painfully prolonged (like Universal's "Kong", which lingered on the animatronic too long).
But with the choice of doing a quick fly-by of the Yeti, it seems pointless to have spent so much money building it with first-of-its-kind technology.
The result, unfortunately, is a Yeti that doesn't work properly right now.
And face it...."B" mode isn't THAT bad. (It ain't great, but it's also not like replacing Abe Lincoln with a motionless wax figure.)
If and when the Yeti is repaired, I don't think it is necessary for WDI to return it to its opening day operation (especially if the Yeti's movements are what's causing its breakdown). I'm sure there is a spot somewhere between "A" and "B" that will achieve the same effect for riders, without breaking the bank or breaking the Yeti.
I'd normally never advocate cutting corners at Disney. But the Yeti never needed to be so advanced in the first place, and I'd be fine if he played a more subtle role after repairs.