Excep c++ is standard, we hake alot of it and plenty of people who know it. You have instead made the counter my arguement. Sometimes new is better and you need to move on. However the safe c++ subset (if it arrives and works as promised) might be better because we have all that c++ and rust doesn't interoperate with it well. (again rust would be better if we had it in 1970 but we didn't.)