I am not sure about who will be tanking, but I can easily say that any team that went ahead for a chance to win it all, could always be contending. I am guessing that Lakers will not be terrible, but Nuggets and Heat and Celtics looks to be great and they will probably still be around, obviously we will get Suns who will have a decent team as well, and that's going to end up with something that has a good entertainment for us.
The Pistons will be tanking as well, the Wizards will have an awful season like always, and I expect that the Hornets will be having a terrible season still even though they got Brandon Miller.
Lakers, Nuggets, Heat, Celtics, Suns.
Lakers - I don't expect them to be tanking either so I agree with what you said. I don't expect Lebron to let his team tank knowing that he's in the final years of his basketball career already, so I expect him to play at his best in order to get that title again.
Nuggets - With Bruce Brown getting traded, I expect their defense to go down at least because he's a good defender. The Core is still intact, so I expect the team to play like almost the same as they was last season.
Heat - If Dame will not land on the Heat, I expect nothing from them. Take note that they gave 2 key undrafted players in Vincent, and Struss, so the Heat have nothing right now at least. They need to get Dame to at least be a title contender.
Celtics - With the loss of Smart, and Grant Williams, I expect them to be worse than what they was last season TBH. Unless they will have role players that will be focusing more on the defense, they will be a lot worse now. Take note that the Celtics have been known to be one of the best defensive teams 2 years ago, and that's because of Grant, and Smart.
Suns - Watch out for them. They have Beal already plus they have better role players right now. They are for me one of the favorites next season in winning the title.
Nuggets vs Suns at the west finals, Heat vs Celtics on the east finals, and whoever wins gets to meet at the finals and the winner gets the ring. I believe that's going to be how it is like but of course we can't know for sure right now. Miami getting Dame would make their place more permeant there.
Where's the Warriors?
I mean they already filled up the things that they're lacking last season. They got better role players now, they also have an amazing coach, and take note that they still have the core of Dray, Steph, and Klay. Maybe let's add CP3 in the list as well. I expect them to be a title contender for the next 2 years or even more, and they will be better in the upcoming season compare to last season.