I'm not sure I agree with acquiring him either, but there's a pretty good chance that he'd re-sign with Milwaukee. I'd give up Thon for him with no questions asked. The issue is that we'd almost certainly have to give up 1 of:
Jabari Parker (highly unlikely IMO)
Khris Middleton (This would be dumb IMO)
Tony Snell (Sure)
Mirza Teletovic (please for the love of God, yes)
John Henson (see Teletovic)
Delly (see Telly/Henson)
If we could do it with a package of Thon, Teletovic, Delly, and maybe a 1st, I'd be fine with it. I'm not cool with trading Jabari or Middleton though.
Point being though, Milwaukee cannot keep all of those pieces while signing DeAndre to an extension. We gotta offload long-term salary in the process if we wanted to.
BUT! DeAndre just hired the agent that represents basically the entire Bucks roster, along with Jason Kidd himself; the Bucks, much like they were with Bledsoe, have been interested in DeAndre for a long time, and DeAndre would also address probably the Bucks two biggest needs: rebounding and defense. It's possible that his agent basically tells teams that he'll only sign an extension with Milwaukee and maybe 1 or 2 other suitors, in which case the asking price probably gets driven down to something that might be palatable for the Bucks, whose starting lineup has been one of, if not the best in the NBA since acquiring Bledsoe.