First things first, Steve & Co did an excellent job of running the event. It's a shame there were not more competitors and that more of the competitors present did not take full advantage of the direct 15-20mph tailwind at 6am Sunday morning.
I think the easiest solution to not running a 240mph 1/2mi car off the track is to use the whole runway to slow down. I didn't see the accident, but I did see the exotics do no chute early turnout braking several times. Start enforcing >175mph = parachute even for half mile and encourage drivers to use later turnouts and I think this problem goes away at Blytheville. There is always the possibility of a blown tire, axle, brake line, or other mechanical failure that results in leaving the racing surface, but Blythevillle is incredibly wide and long compared to other venues. I think there is a relatively high safety factor here compared to a half mile long road course straight and bumpy shutdown like NOLA. In the current Street Category rules posted, there is no requirement for parachutes and it does not direct the reader to the full set of rules which clearly still state: "An approved parachute is required on all cars over 175 MPH." and " Parachute deployment is mandatory over 175 mph.". It's good to know that the modern street cars were abiding by the rules set forth for cage and seat, but I think it's strange to include Real Street and Super Street on that page of the rules and are required to do safety per the full rules, but allow Modified Street to only use the rules on the Street Category page.
FWIW, I think that rear only brake LSR vehicles using Bonneville push truck rules is a great solution. Lots of shutdown room at Blytheville and I don't think anyone has came anywhere near the end of the course yet.