> My guess is less than .01%
I'd say that your guess is very bad.
> It’s disingenuous to play the “green” card here.
No it is actually disingenuous to act like this is about "tinkering with apple devices". Actually it is hard to express how disingenuous the whole spin of "If people are able to repair products they will become worse, I don't want my product to become worse" truly is.
Especially so when we start talking about devices that actually would be repairable if companies didn't spent some truly petty amount of effort to stop it, using DRM and crippling via detection.
Besides that there is a market for refurbished iPhones, actually there are shops that specialize in selling nothing besides them, and the ones buying from it are hardly the evil hacker/tinker people you describe, that want to take away your shiny apple elegance by forcing different product designs...
> I don’t think any large number of people would suddenly say they want to keep their slow, heat-generating Intel MBPs if they were more repairable.
What about the concept of a device being sold used instead of sitting in a box until it gets thrown into the trash? The whole "people just want the new and shiny anyway" is a very priviliged way of thinking. Being able to repair something is more than you keeping your device and repairing it yourself, it also means that suddenly a device still has use instead of contributing to the pollution just because some company rather wants to see you burn that thing in your backyard than seeing it get any use in the hands of someone else.
Besides that: There is more technology than Apple, not everybody has to care what the Apple fan bubble thinks. Apple (and the people that defend this mess when it comes to repairability) just reaches critical levels of hypocrisy when it comes to the "we are doing good for the environment" advertisement.