Bad idea. If the canopy won't open, firing the ejection seat is likely to spatter the occupant.
The ejection seat on my planes went right through the canopy! But, it would destroy the cockpit, and...ejecting is dangerous under the best of circumstances, lethal under the worst.
Yup , newer aircraft create newer problems . When one of the prototype F-22 aircraft belly bumped during a takeoff a fire resulted that burned up the left wing and fuselage . The firefighters had major problems extinguishing internal flames because of the new composite skin of the aircraft . Either Popular Science or Popular Mechanics had an article pertaining to this , and showed a new firefighting tool to punch a hole through the skin and allow extinguishers to be used . As Super Chicken used to say to his sidekick Fred , " You knew the job was dangerous when you took it . " !