Define "future proof." No computer is truly future proof, say, I have a Pentium 4 ht computer from back near the begging the 20th century, it still works the same as it did back in 2002, but the software has far surpassed it that it has ceased to be of any use to anyone. In time, that will happen to your computer, but chances are is that it will still work as well with software of now, but unless you want to continue using autocad 2014 in 2018, you will want to update your computer's hardware again.
Well 3-4 years is what the term future proof means right?
I really dont know. right now I would go lga 2011 for 6-8core support later on when games and apps become more core/bandwidth sensitive, that way it may last a little longer, but that is just my opinoin.