I can answer that. The tests went
great. Great enough that they moved forward with plans to install it...only to have it cut.
A couple more points:
- Matterhorn has undergone several extensive refurbishments in it's 50 years of operation. Like the one where they added the ice caverns to the interior with the yeti. Also, it has had it's track replaced already, some of it more than once.
- Disneyland's mountain. Yes, due to structural issues they had to replace pretty much everything in the building. But, they key point is, they did the work they
had to do, as well as going
much farther with new show elements and theming. For all intents and purposes, they got a new coaster, not just a repaired one. It's like a wrecked car. DL junked the wrecked 1977 car and went out and bought a brand new 2005, top of the line model with all the bells and whistles. MK...are keeping their wrecked 1975 "classic"

rolleyes

, and taking it to the body shop for some dent work, bondo and paint. Maybe a wash.
- MK's mountain needs new track. It has carried more guests than any other steel coaster besides Matterhorn (see above) and it's age is showing in the ride's structural integrity. Simple fact: By today's standards, it wasn't built to run 12 hours a day, 365 days a year, for nearly 40 years.
- Adding audio to the trains would not equal "tens of millions" of dollars extra expense. It could be done using the existing track and support structure, only adding some additional support. And yeah, new trains.
- My problem is this: There have been plans in place for years now to do a full, DL scale refurb to the mountain, bringing it to the level of it's counterparts in DL and Hong Kong, and better than Tokyo. Many hours of imagineering time, lots of money invested....only to finally have it cut down by about 50-60% for two reasons: Time and money. Fear of MK ops to have it down any longer than necessary due to the impact is has on the park (their own fault for not adding more rides in the last 15-20 years) played a huge part in this decision. Money...not quite as much. Money was budgeted previously for a larger refurb, but was taken away when they decided to cut the scale of the job. This budget was set aside for SM, and would not impact the building of any other attraction such as Mermaid.
- Bottom line, using one of Disney's own golden rules - Show over Efficiency.
If it costs a bit more to give a better show...it
must be done. Basic Keys to the Kingdom.