Trials games are notoriously hard on expert courses, which makes them a perfect contender for an Olympic event. Reducing faults (how many times you crash in a single run) would become key if this game were "raced" professionally. Right now, players on the leaderboards can take as many attempts as possible for a perfect run, but with only one chance to get the best possible time, there is much more room for error, which ultimately makes for more exciting competition. It would also be interesting to see a relay-style race using multiple competitors on multiple tracks. The added pressure of the Olympics would make the races that much more exciting to watch, while competitors wouldn't be able constantly restart for perfect times.
The game is also fairly pretty to look at, especially during epic jumps with incredible vistas in the background.