Time is also an ingredient. I think this season sets the timer. There are still too many unknowns. While I wouldn't be adverse to picking up a starting, veteran PG, there is still a lot to asses.
1. Who is Burks post surgery?
2. Is Hood really good, or was his end of season play a fluke?
3. Have Hayward and Favs hit their ceiling?
4. Can Gobert bring it for a whole season?
5. Has Trey plateaued?
6. Who is Lyles?
7. Can Exum get it together over the course of the season.
Obviously, 7 won't be answered. But the rest will. I think if 3 or 4 of these are answered positively by ASB it's time to go. But it's going to take assets, so let's make sure we move the right ones. It's going to take Burks/Hood/Trey to some degree to bring back the player we need, IMO. I don't think we're ready to make that call. Or are we?
If Hood is really good then why trade him? I still think Hood is going to surprise many here. I do not want to trade him. Like you said there are simply to many variables right now.