Crafters already serve the highest purpose: profit.
'Sides, durability isn't gonna be anything but a nuisance to "hardcore" players-- no matter what the system ends up being, anybody reading this thread will figure out a way around it. It's gonna be death to casual players though. That might not seem like a bad thing, but it means death to casual gamer cashflow too.
SE has probably said somewhere that they're planning to make the game accessible to both casual and hardcore players or something. If durability is the feature that breaks the casual camel's back, they're gonna start to fiddle with other needles in the haystack and pretty soon you've forgotten how this metaphor goes and it isn't pretty. SE has a history, post-CoP, of trying to cater to casual cash and lure the casual gamer away from WoW: campaign replaces content, $10 jerkoff expansions give gear equivalent to Usukane, CoP gets nerfed, etc. Has "hardcore" content seen similar expansion? Since Salvage, the last "hard" content I can think of is ZNM... and judging by the skins on the Aurum/Enkidu/Oracle gear, I think you can guess how much effort they put into it.
My concern is that SE is gonna screw up durability for the casual gamer then try to rebalance until finally three years from now they either revamp durability or remove it.