Just read an interesting article about the Vicis Zero1 helmet.  This helmet is essentially designed with crumple zones like your car.  I'd say $1500 is a small price to pay to avoid the potential of CTE.  It'll be interesting to see if teams pursue using them.

Zero1, a prototype by Seattle startup, Vicis, channels the protective techniques of a car bumper by deforming slightly upon impact, and then regaining its shape.

Unlike standard helmets, the design is soft on the outside and hard on the inside to slow impact before it gets to the head.