Novak would have destroyed him last night.
And Rafa will beat him easily at RG
Perhaps I am misunderstanding your facts, but I thought they were not taking points away from last year's tournament results?So the current end of year points totals for the top 3 (after removing ATP WTF 2019 points) are:
1.) Djokovic - 10,660 (200 removed from WTF)
2.) Nadal - 9450 (400 removed from WTF)
3.) Thiem - 8325 (800 removed from WTF)
Now let's look at the potential point gains for each by the end of the year:
Consider each player's maximum point gain from the only ATP 1000+ tournaments still to come this year: Rome (1000), French Open (2000), Paris (1000) and WTF (1500).
Note: Thiem has withdrawn from Rome.
1.) Djokovic (400+1280+0+1500) => 3180 -> Max: 13,840
2.) Nadal (0+0+640+1500) => 2140 -> Max: 11,590
3.) Thiem (0+800+910+1500) => 3210 -> Max: 11,535
There are additionally 3 ATP 500 tournaments you may want to consider:
Hamburg (500) - Week before French Open
Petersburg (500) - Week after French Open
Vienna (500) - Week before ATP Paris (Thiem is defending champion so can't gain points from here anyways)
I feel like it's quite reasonable to rule out the ATP 500's from coming into play in the rankings. So realistically for Djokovic to not finish YE #1 either Thiem or Nadal have to at the very least win the WTF (likely undefeated), with Thiem needing to at least win French Open or Paris as well. And all that is ignoring any potential point gains for Djokovic in that period too.
Tl;dr: Thiem hypothetically could finish the year as world number 1 but would need to basically win the other 3 major tournaments he's participating in and even that may not be enough if Djokovic gains some points in other tournaments (e.g winning Rome, French Open final or some wins in WTF).