I'd be absolutely fine with a canopy but those weren't safe enough apparently,although the test was very extreme.
(They tested some insanely thick canopy, blasted an F1 wheel at it at ridiculous speed and it failed...)
Encasing the driver's head more on the side might be a good start.
Like raising that "hublot" bit to over the driver's head and pushing it forward, making that bit kind of like a tunnel, you could extend the airbox over it,but i bet that would be ugly...we should get some designers on this topic.
You would end up in trouble with visibility but maybe they should replace the mirrors with camera's and put some small screen to each side of the driver, inside the cockpit. (crazy idea, i know
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Maybe we should have a general F1 safety comments and ideas thread?