This aversion to ending a race/season under the safety car is bizarre. The 2012 Brazilian GP was the title decider and ended behind the safety car thanks to Di Resta being shit and that's remembered as a classic. If there is time to get back to green flag racing, great, if not then just end under the safety car, don't muck about with red flags or rule changes mid-race.
This crash and amount of laps remaining did not warrant a finish under SC. 8(?) laps of SC in the title decider would be a joke.