I have never given this scenario as much thought as I have in the last 24 hours. The more you think about it the more alarming the whole issue becomes.
Agree. ISTM this is probably the worst case situation and I am not aware of any trials having been done. Consider:
1. Slides are not armed
2. Cabin crew probably at L1 saying bubye
3. Driver(s) may be out of cockpit doing same
4. Pax totally unprepared, encumbered by (generally large) carryons
5. Doors and overwing exits not manned
etc.
There might be a catering truck at one of the doors, but there's no way off it without lowering the lift. Highly unlikely any steps available or handy and jumping from a 777 (say) possibly suicidal.