I'd be all for it, given that we signed Monroe to a reasonable extension. Monroe / Sullinger / Olynyk would be an incredibly skilled frontline that can score, pass and rebound. Defense would be more challenging, but I think you can get there with the right system.
Jeff Green is an ok piece - but this trade makes tons of sense for both teams. Monroe is more valuable long-term and Detroit needs a roster realignment. And as mentioned earlier, SF is a position we could fill.