Resorts should offer this up with MTB park for more summertime revenue....
They are planning on it. That's why the The Ski Area Recreational Opportunity Enhancement Act was passed and signed in November. Many in the MTB community think that it will allow for ski areas on public lands to build more MTB specific trails, but it was really designed to let Vail Resorts -who approached Sen Udall about sponsoring the amendment- to build an Alpine Coaster on Vail Mountain. Most of the resorts aren't interested in building MTB trails as they see them as being too much expense for too little income -Whistler, N* (ironically now managed by Vail Resorts) and the like notwithstanding- since "we" generally don't spend the kind of money that they'd like us to and MTB'ers don't represent the "authentic mountain experience" that they are selling to the "normal" tourist.
They have one in Jackson, WY. Pretty fun, but still family friendly.
That is an alpine slide in Jackson, different than a coaster. The coaster is closer to a real amusement park roller coaster where you ride attached to a steel track almost entirely elevated off the ground while with the slide, you ride down unattached in a concrete chute that is mostly on the ground. Lot's of coasters in Europe, only 3 or 4 on North America.