I'd support this idea, but only if the following countermeasures were installed:
Headshots: Instead of a pilot wound, an open canopy would leave it's pilot vulnerable to having his head removed with a cannon strike, causing a geiser of blood to spray up in the air, and a huge red message to flash saying "HEADSHOT!", and of course resulting in sudden unexpected death.
Jams: Open canopies could be damaged like flaps or gear, resulting in the canopy being stuck open, or shot completely off. In either case, I want the resulting windnoise to deafen, at least temporarily, the pilot, and/or possibly freeze him to death should he exceed a certain altitude.
Increased drag: Having a 2' diameter scoop with no outlet sticking off the top or front of your plane should cause drag. Hinged canopies should rip completely off, and ideally also find another way to decapitate the pilot.