I am really suprised they could not get out...it's not like the wheels have any power in them. I landed in YYZ a few winters ago and the plane went off the runway (during taxi so not a big event) and ended up in the snow, they powered up the engines as if we were taking off and managed to get us back on the runway and on our way to the gate...
I feel bad for the pilots and I hope Porter had no pictures of this...