We'll need to overhaul the concept of limited liability before we do that though, the thought of someone being left without their eyes because a company goes bankrupt and no-one is at fault is pretty horrifying.
Ray Ban does it for their Meta glasses, but Lensology can handle stronger prescription lenses.
Ehh, there is nothing special about the lens, all the magic is in the frame, and the rayban and oakley frames look very similar to their standard versions. Getting new lenses for sunglasses is very common.
Have you never had prescription sunglasses?
The frame will probably change slightly over time to make them incompatible.
I just sent an old pair of glasses to eyeglasses.com for new lenses. I never considered this to be a big deal.
This is probably true.
The rest of your comment is probably not true for most people.
It just depends on how strong your prescription is and how willing the shop/website is to do special orders.
If you are almost blind, then your choice of lenses/frames will be much lower than if you are only slightly blind(most people). Any reputable eyeglass/optician shop should be able to make custom lenses for pretty much any frame. They can't always do the super sleek shades that some people like to wear.