Let me just throw this out there...
Anybody who knows enough about skiing to notice the mistakes they make, doesn't NEED an announcer! Announcers are just there for random people who cant tell the difference between tricks, and lets be honest, how many gapers know/care about the difference between a dub 12 mute and a dub 10 blunt?
To quote the great Richie Morgan on announcing the Huck N Tuck at lake placid "No one knows what theyre doing anyway, so i just say random stuff to make them happy."