Trading Rondo for CP3 is perfectly reasonable, adding in Jeff Green is probably a little undesirable but for the most part understandable and fair, but trading Rondo, Green and two first round picks for CP3 without an extension is completely mortgaging the future of this franchise. I don't know why Danny and Doc, who is signed for five more years, would want to risk heading into next year with Avery Bradley, Paul Pierce and JaJuan Johnson under contract, along with presumably no draft picks. Unless they strike gold in free agency - and if CP3 leaves, then there's no real gold to strike - this will be the worst team in the NBA next season.
Sure, having Rondo, Green and two picks isn't going to win another championship after this year anyways, but proper drafting can at least put them into a position of possibly succeeding in the future. Doing this deal is borderline irresponsible if you don't win a championship this year. I guess that's the if...
And at this point, Rondo is probably going crazy.