For instance .... If they build a ride on the other side of the berm/DLRR .. that means a TUNNEL. They have to theme that tunnel somehow. They have to budget for that THEMED tunnel .... This is where they could "sneak" it in. Or ... whatever ride they create .... say the ride has 6 scenes to it. 1 of those 6 scenes could be "rainbow caverns" as part of it.
I think the main problem .. is ... Who within Disney would be dedicated enough to spear head such an idea?
And I sincerely hope those "dedicated imagineers" out there who read these boards take note.
You take everything everyone has stated in this entire topic .. and you can't deny ..... there's value to the best elements of Natures Wonderland Mine Trains that COULD be integrated into Frontierland's future.
Even today's generations who look for state of the art "WIZZ" "BANG" "IN YOUR FACE" thrills .. can still appreciate the art and beauty of glowing water falls with every color of the rainbow!
Geyser Mountain 2.0 (featuring "Claude Coats Caverns") ..?