Found the interview with Wes from February 2014 where he mentions wanting to direct a new Elm Street if the script is good and if approached by Warner Brothers. He states he would only do the movie with Robert returning!
http://www.aintitcool.com/node/66071
It's near the bottom of the interview.
Oh well
I still want Robert to do one final sequel though!

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That would've been great

Scream 4 was not going to be it for him, and he was considering directing new movies. He actually was interested in directing a final Elm Street movie, but because Platinum Dunes owned the rights, Wes knew that the chance was slim.
I linked to this interview with Wes where he mentioned Elm Street, and how he'd like to return for one final go.