This topic is really one about the philosophy of the class as a whole. Does anybody really think that changing from 3/4 to 1 car is going to change the amount of car contact that happens? I bet many of the racers in the paddock will have a different answer for this, none of which match even the CCR answer.
What we need is for each region to stress the importance of avoiding car contact. We have to have a better understanding of when to press the situation of passing as opposed to laying off and waiting for a better setup. This is all part of race craft. I have run along side a lot of out of class cars this season and not had contact with a one of them. I credit parts of that to positioning myself aggressively on the track to prevent a bad situation as well as conceding the position preemptively so I can control how the pass happens. I hate out of class contact, its the worst kind of contact but unfortunately some of those in my region have suffered it several times this season.
As for in class contact, it all comes down to respect and knowing your limits. The time to test the limits on your own is in practice where you aren't at liberty to take out a fellow racer. Approach the limit slowly so that when you exceed it, its much less of an event. When in the heat of battle, all you have control over is what you do. Put yourself into a position so that if somebody else your racing makes a mistake, you wont get caught up in it.
Learn what the difference between low and high percentage passes are. Certain parts of the track are not conducive to passing, others are and as the intensity/speed goes up (Nationals) so does the risk of all passing. Adjust both technique and talent accordingly.
I think ultimately this comes down to regions stamping out any excuse for car contact. Regional Directors need to enforce the rules and educate the standard, but punish when the time is right. We don't want to scare anybody away for making a mistake tied to being overwhelmed, but a class that becomes known for being the "Spec Pinata" class is less likely to attract new members like we want.