Simple solution, anyone who simply must have their bags must wait until everyone else is off prior to leaving aircraft.
If you find yourself blocking a row you must move to the next available empty row to wait to collect your bags.
That way if the plane is in fact in any danger, only those that feel their bags are more important than their own, or more importantly anyone else's lives will be left on the aircraft.
Perhaps a locking mechanism could be developed for the overheads to ensure compliance with this.
I certainly understand the need to keep your bag when traveling, but not at the expense of some 5 year old kid and his mother.
Just because you don't see anything wrong from your 5a window doesn't meant there is not an inferno just outside 32 f.