Snowmobiles are great too, though they get stuck, and overall as a group, snowmobiler's are not very avy aware. It's getting better, but this year alone snowmobilers account far half of the avalanche deathes out there.
Not to jack the thread but I just wanted to point out that those 8 snowmobilers that died near Fernie BC were all avalanche prepared with beacons, probes the works. If memory serves they even had one of those new satellite emergency transmitters with them.
So I guess I am just trying to state the obvious that even if you are trained and know how to use the gear making the proper decisions from the start is what saves lives. If they hadn't entered complex terrain on an high risk avalanche day they may still be around.