It was really crap from a spectator's perspective but not necessarily against the rules. I hope they don't head off and change the rules. If they do, then they could say 4 minutes to the end of Q3 is the latest time that a car can go out on track, any later that do not make it to the start line on time may be penalized or something. Or the race director may exercise the right to add an extra lap if it looked likely that 80% of the grid would not make it to the start line for whatever reasons. Any of these options would be unnecessary as this sort of thing rarely happen.