Philly has the right to pick swap with Sacto the next couple of seasons and then gets Sacto's outright 1st 2 years after Sacto conveys its pick to Cleveland. Sacto isn't going to go into tank mode only to lose the pick they tanked to get whether it is swapped with Philly or sent to Cleveland.
Ok so that's not quite the situation. The pick goes to CHI this year protected 1-10. If it lands above the PHI pick after the lottery then the picks switch. Chances are it isn't conveyed to CHI. Let's assume for the rest of this it isn't.
In 2017 PHI will again have the rights to swap, because the 2016 pick wasn't conveyed to CHI this one is also protected 11-30.
In 2018 Sacramento will keep it's own pick as it didn't convey a pick to Chicago in 2016 as I understand it. If I'm wrong then the pick is 1-10 protected anyway. Then unprotected in 2019.
So they have 2 scenarios:
1) Go for the playoffs. In this scenario they will probably convey their 2017 pick to CHI and their unprotected 2019 pick to PHI. They would keep a pick in the 2016 + 2018 drafts but if the plan worked the 2018 pick would not be a lottery pick.
2) Start over. Here they would have the worse of the SAC/PHI pick this year. In the unlikely event they won the lottery the worst pick they would get from PHI is #4. Next year will probably be a pretty similar situation. They would still have their own pick in 2018 as well. So they would have 3 years of good to great lotto picks. Add that to the potential 2 BKN picks I was suggesting and that's a great rebuild.
If they tank the picks aren't going to CHI, the only thing you worry about is the swap with PHI. Are PHI going to get that much better next year?