Not going to happen... destroys the purpose of indestructibility and weatherproofing.
If you have the swivel open and you drop the DSLR, its going to break.
Too many creases between the swivel parts that make it less waterproof.
This is an urban legend, of course you can make a waterproof swivel screen, man has been to the moon.
And the "it might break if open" is like "you must not use a flash on a hotshoe, it will break if dropped" or "only use p&s with retractable lens, a lens on a dslr will break"... the swivel screen only on the 60d/70d and not on 7d is because 7d is older, and might not on 7d2 because of product differentiation and people believe this legend. Furthermore, you'll usually use the swivel screen when on tripod, and it makes a great screen *protector* when turned inwards.