I agree with your speculation that George may soon become available, if he isn't already.
The Young-Ellis-Teague core is not going to get you a championship, but they are good role players to have around for a rebuild. Myles Turner can be the future of this team, but does George want to wait another year or two for him to be ready for a playoff battle?
It'd be ideal to give up one of Bradley or Crowder (i prefer to give up Bradley), one of Smart or Rozier, one of Brown, 2017 Nets swap, or 2018 Nets pick, and the future Memphis pick.