the monster truck class has yet to die nor do I think it will. I, however, do not think that the "truggy" class is a fad, they are WAY easier to drive, and a little faster, and more adjustable. I do not see ther monster truck class dieing, as the bulk of newer racers buy the monster truck because they are less expensive over all than a "truggy" and there are always going to be new MT racers.
Rod