Plan A: Sign Durant + other max player (presumably Kyrie). Accelerate rebuild and contend now (for the next 3-4 years). As much as everyone says the superstars will want 4 years max, the contract format du jour is 4 years, with player opt-out clauses.
If KK/DSJ/future picks can get you AD WITHOUT trading Robinson, you do it. Maybe you still do it with Robinson as a key component. I don't know. KK and DSJ are basically beggar's version of KD and Kyrie at this stage of their respective careers. On one hand, you can play the same sets if KK/DSJ are their understudies - and maybe they'll be as effective vs the 2nd units of other teams and can expand their games with less pressure. They're both extremely young. Let's also not forget that Knox was unbelievable in last year's summer league - It was a long season for him, but perhaps he'll remind folks how awesome he was not that long ago.
Plan B: go with the young guys, fill up with more lottery busts/high upside guys in need of development. I wouldn't really mind trying to develop a young core of Robinson/Knox/Barrett/Ntilikina/DSJ/Trier/Dotson/Vonleh/Hezonja. In particular, I'm very interested to see what a summer with our player development gurus can do for DSJ and Knox. For this collection of players, I think RJ Barrett would be a HUGE difference maker.