the issues with the bumpers going under the kart was fixed for the new gen 2016 versions. As far as getting rid of the rear bumpers it wont happen, the CIK instituted them for safety reasons and even if they have made racing less safe due to the bumper car mentality they still wont back track.
I coach my son to accept that people make mistakes and sometimes in racing you take it on the chin if it is your fault or not. You dont have to be happy about it but you do have to accept it. the frustrating part is when the other person takes no responsibility for their actions.