You’ll survive for quite a while once you’re below 6000 m. In free fall that would take you around 90 s, assuming a fall from 11000 m, and that it takes 200 m (5 s) of fall to reach terminal velocity of 200 km/h.

This is quite rough, but gives an appropriate order of magnitude. In those 90 s, you would be very likely to pass out and be guaranteed to get severe frost bite. We’re talking major amputations levels of frost bite, as you would be moving at 200 km/h, exposed, in temperatures in the -50 C to -10 C range. I’ve seen people get frost bites moving at 40 km/h in -15 C for a couple of minutes with just a sliver of skin exposed.

So short answer: You might survive getting into the survivable range, but at the very least you will require intense and immediate medical attention upon landing. Seeing as there will be potentially a couple hundred people spread out over a large, possibly remote, area requiring this attention, it’s unlikely that many, if any, would survive the ordeal, even if most people survived the initial 5000 m of fall into the survivable altitude range.