I agree. They need to be careful on their reaction to these two incidents. They can force the teams or suppliers to come up with extravagant ways to protect the drivers from head injuries, or keep on, as they are, developing better and stronger helmets and cockpit walls. I would go with the latter. These injuries are rare these days, so knee jerk reactions to them could impact the drivers comfort or ability to perform in ways that aren't properly thought out.
I think both these incidents, although so close together, were complete freaks, and should be looked at separately. In the Surtees accident, the prime issue was the tire tether breaking, not the injury sustained. If anybody gets a tire in the head at speed, it is likely to be fatal, no matter what the protection. So look at the tire tethers and improve them. The Massa injury on the other hand is so unusual, that it will likely never happen again. The chances of a heavy enough piece of a car coming off (most bits are carbon fibre don't forget, and would have hit his helmet and harmlessly bounced off it), and actually finding its way towards a drivers head are miniscule. Anyone who could figure out the odds would quote you in the billions to one, I'm sure.