It's clear from the replays that, as a result of the angle of impact, the nose dug into the barrier and this ripped the front and safety cell off the car.
As Brundle intimated earlier when they were replacing the barrier with concrete blocks, these are almost better as, whilst they don't absorb any impact, they also can't be easily penetrated.
I wouldn't be surprised if changes come from this requiring all 'naked' barriers to be covered with tyres or Tec-Pro or such like.
As I posted earlier.
Hitting a concrete barrier head on, or even at a heavy angle will bounce off yes, but will result in an instantaneous massive deceleration, as the concrete will not move, that will be a huge magnitude more dangerous for the driver, compared to a far more gradual deceleration when impacting Armco barrier that is specifically designed to move and bend and thus absorb all the energy of the deceleration so the driver sees far less.
From all the work I've been involved in with crash barrier design and testing, I am far far happier having seen this crash being into Armco, than having been into concrete.
We would, in no way, be in such a thankful state currently, had he crashed like that into concrete.
Also it will be prohibitively expensive to cover all track barriers with tyres or Tec-pro or anything similar, think somewhere around 5 to 7 miles of barrier to cover, around average 2 to 3 mile length circuit.