With respect I have yet to see a plastic LCD screen that got all scratched up that doesn't detract from image quality (or resale value) and is as easy to change as a screen protector! Just a thought!
Someone did say the 6D screen is plastic didn't they?
And I have yet to see a screen protector that looks near as good as nothing at all so long as the screen isn't scratched up. I have no idea what you guys are doing to your cameras to scratch them up so much, but I've never had an issue with mine. My XTi spent 2 years in a backpack full of climbing gear traveling through S.E. Asia, and it still looks fine. My phone comes in an out of pockets with keys and spare change countless times a day, tossed on tables, slid on floors, and chewed on by my kids, and it's fine too; never seen a need for these screen protectors some use, but never bothered to try to convince them otherwise either. Some people like their gadgets and protectors and bubble levels, some don't.