Not being about to take apart a laptop isn't going to kill the environment.
No, but not being able to safely and economically dispose of the mountains of electronic junk generated each year in a country of 300 million people could be a major headache. (Or, for those of us outside the USA, rather fewer people living in a much smaller area with fewer opportunities for landfill).
A quick Google suggests that Apple are currently selling 3-4 million Macs
every quarter - and that's just one manufacturer making one particular category of product, so you need to multiply that by, oh, I dunno,
lots, to get the total volume of junk that will have to be disposed of in 5-10 years time. How much do you want to bet on all those companies still existing, with "bring it back to us for recycling" policies still intact, by then?
I doubt that even Apple have budgeted their recycling project for that long (and I bet the budget only assumes that a fraction of Macs will actually come back to them).
But no, let all the other companies making slightly thicker laptops worry about this - Apple should get a free pass because they're so, so pretty. Of course, then no manufacturer will want to join if it means that their laptops will always be 2mm fatter than Apple's.
Oh, and I'm sure that EPEAT would love to extend their register to mobiles and tablets if someone funded them and/or if there was demand from the 'users' of their ratings (i.e. companies and government institutions who want to be environmentally responsible). Maybe that has something to do with Apple's departure.