LMA will not be eligible for the DPE. It's only available to a player's originally drafting team, unless, like Harden, they are traded on their rookie contract.
I've been saying that GS will fall apart by next summer, and by that, I mean not all of the four players will be there, since last summer. I think in maybe 2-3 years, it will be Durant and Curry, and they'll both be on the high side of 30 by then. People are inevitablly surprised when things fall apart, but nothing lasts forever. It was a freakish combination of cir stances that led to their roster being able to be constructed the way it is.