Here's what the Jazz gave up for Mike Conley: Jae Crowder, Grayson Allen, 2 1sts. Not exactly a load. Kyle Korver was added as extra salary.
Here's what Milwaukee gave up for Jrue Holliday: Eric Bledsoe, George Hill, 2 1sts, and 2 pick swaps. They paid a premium in picks because they needed Giannis to re-sign.
There are only a handful of teams in the league who are willing and able to take Siakam's 3 years @ $115M remaining on his contract for a 2nd-tier star player. It all depends on what the Raptors want to take back. Maybe the Pacers will give Myles Turner and change. Maybe the Hornets will give Rozier and Miles Bridges. Golden State would certainly offer Wiggins' contract.
If Toronto can get MPJ, Barton and change from Denver, they should take that deal, but who knows if Denver will offer it.