Originally Posted by
mattp1987
I started reading that post the same way you did, but I think the actual point was that the poster thinks it would be beneficial to both Delta and the customer to always offer that option and therefore Delta should add it to all trips.
Well, starting June 2016 (?) "all" international fare classes can upgraded with miles. Now, the number of miles... that's sort of the issue.
Though, the "rare" ex-USA kiosk offers for transatlantic have been around 75K miles or $750. (I heard that data-point, did not experience it myself)