It is Pirelli's problem. They changed the carcass from kevlar to steel for 2013 in order to get it closer to a proper radial (Pirelli were one of the first with road car radials) away from a bias-ply carcass. This was when the tread delamination started. They tested a new way of fixing the tread to the carcass which worked, that's when the disintegration problems started.
The issue here is not wear, it is the failure of the tyre when it is cut by debris, or allegedly a kerb. It will fail at the weakest point. That was the tread's adhesion to the carcass, and since they fixed that the weakest point moved to the carcass itself.
For Germany they are proposing to go back to the bias-ply kevlar design as that will resist cuts better especially to the sidewall. From Hungary onwards they are proposing to go back to the 2012 tyres with the kevlar bias-ply construction and last year's compounds. The other advantage of the kevlar construction is that, if there is a catastrophic failure, the bits flying through the are are lighter and not made of steel so will cause less damage.
Amid all the hype and unfounded conjecture the root cause of the problems seem to have been lost. The problem remains that a catastrophic tyre failure at circuits with barriers closer to the action, like Hungary, is very dangerous. Now that the FIA and FOCA have played the safety card, we can expect action. IMHO the worst part of this is Pirelli being too worried about their image to call "safety"in the first place so they could make these changes before the British GP. It's come to a pretty pass when they seem to have risked a serious accident because they don't want people to think their road car products are unsafe.
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