Another thing I just thought of. I'm not sure the price: gorilla glass screen.
I agree with anyone who's said better battery life. I don't require it, but it could never hurt. This year has been a little different since I spent so much time inside, but I'm an outdoorsy guy who's often away from an outlet for 10+ hours, with my Switch. I love sitting and playing under a tree, or in a park somewhere. The high brightness levels I have it on mean that even lowfi games tend to eat battery. Normally, I have a battery pack on me, but I'd rather not.
I would love to have a longer lasting battery, larger screen, and a better quality screen (more scratch resistant without the need of some third party protector). I wouldn't mind a Switch Pocket either, smaller screen, easier to carry around without a laptop case.
to be completly fair, the plastic screen is part of the reason why the switch is so durable, something that might shatter gorilla glass would just casue a minor dent in a plastic screem