Horford, IT, PG, and Hayward isn't enough to win a title. It would be a very good team, but clearly behind Cleveland and GSW.
Makes absolutely no sense to trade our 3 young assets (Brown and the 2 picks) to put a team together that a) may not have a lot of longevity and b) isn't good enough to win a title.
OTOH, if we draft young players, as Wyc said recently, you've got them for several years at a less than max salary.
A Horford/IT core plus adding a few good players like Hayward isn't enough. We'd have a core still devoid of an elite player. IMO, the only reasonable course of action is develop Brown, Fultz, Brooklyn 18 and build around them. Those players, plus Brad Stephens and salary cap flexibility is a much more sound course than blowing everything on Hayward and George.
Disclaimer: if giving up the BRK 17 pick gets us AD, then I'd be all in on that. I wouldn't give up both picks, however. Too much chance we get a transcendent (there's that word again) talent in either this draft or the next.