I think the only way we would do such a deal is if we a) knew Siakam was a high chance of extending, like KP, and b) had some moves in the pipeline to fill out the bench. Whilst the starting lineup rocks, the bench is less good.
Porzingis / Williams
Siakam / Brissett
Tatum / Hauser
Brown / Walsh (?)
White / Banton (?)
Toronto, on the other hand, would have a very interesting group. Not sure how good they'd be, but super deep
Poeltl / Horford / Achiuwa
Barnes / Boucher / Young
Anunoby / Dick / McDaniels
Trent Jr. / Brogdon / Barton
Schroder / Pritchard / Flynn