The list of teams that will begin to tank and may give vet on solid contract just for a future end 1rst draft pick, is probably shortest than what we think because of the playin and that few teams will tank and discount their vets.
Team that will very probably tank : Wizards, Pistons and Wolves. The solid vets that they can propose are not that much interesting : Bertans is the one who fit the most but still big limiations (salary, last yer contract year, defense, Po performance), Rose as good role players and some end bench guys like Hernangomez .... But may just be min buyout signing. I didn't mention their star players like Beal, Griffin or Grant but they will be too expensive (Grant would be a perfect fit but it is impossible I guess) or uninteresting and too expensive (Griffin).
Some teams may still seak trades for their future but won't discont the team and won't want to loose it all : Memphis, OKC, NO, Chicago, Cleveland,Houston, SA, Orlando and NY. So it gives Gordon, Vuch, Fournier, Valanciunas, Ball, Redick, Horford, Porter, Markannen, Drummond, Love, Oladipo, Derozan, Aldridge, Mills, Randle -maybe-, Ntilikina (and I forget some). Some interesting names, but this teams arn't going to give them just to dumb salary, they can compete now and will accept a little downgrade only if they get solid future assets (like good potential rookie(s) contract -we have plenty- or first round pick(s)). And some of this players eat all TPE for just 6 month rent... Not very engaging.
Unfortunately, I also think Barnes would be the perfect goal, but he is playing too good and Sacto also. They will go all in for the playin. It is a fake realistic objectiv. Many teams may fight for few players in fact (few cut and few discount). We have the TPE advantage, but still few assets... Since I know we can wait the end of the year to sign a FA for multiple year, I ask me if it isn't a better to wait and sign into a long term contract one or two guys like Oladipo, DeRozan, Drummond, Powell, Ibaka or Harell, by exemple. I really don't know because I am on the camp who think we don't miss so much to compete now.