This is a table with points from 2020 Race + 2020 (Almost surely) canceled Slams and Master 1000(Points from 2019):
If canceled tournaments points will stay until the same tournament will be played in 2021, Federer would carry at lest 4020 points until AO 2020(500 from Halle), 4520 if Basel won't be played.
Today, with 4000 points, he would be #6 in the ranking.
Thiem can easily be above him at AO, and someone, most likely Medvedev(1000 points from Shanghai if they won't play), and maybe players like Tsitsipas can fill the gap.
But it's a safe prediction that, if players can carry these points in 2021, Federer will have a #5-#8 range seed at Australin Open 2021, with a relatively easy draw and a medium-high seed secured at least until Wimbledon.
Conversely, if they decide players have to drop 2019 points at some point in 2020(HERE I tried to guess how it could work), Federer would have only 720 points at AO 2020.
Today, with 720 points, he would be #76 in the ranking.
With less tournaments played in 2020(Ex: No points from Wimbledon for everyone) rankings point would be lower overall, so he can probably be around #45-#50 in the world. But it's a safe prediction it would be unseeded.
And he have to defend all his ranking points in one tournament(Except some if he play tournaments like Doha or ATP Cup before), where he can play Nole or another top 10 in the first round.
The difference is huge in my opinion.
If canceled tournaments points will stay until the same tournament will be played in 2021, Federer would carry at lest 4020 points until AO 2020(500 from Halle), 4520 if Basel won't be played.
Today, with 4000 points, he would be #6 in the ranking.
Thiem can easily be above him at AO, and someone, most likely Medvedev(1000 points from Shanghai if they won't play), and maybe players like Tsitsipas can fill the gap.
But it's a safe prediction that, if players can carry these points in 2021, Federer will have a #5-#8 range seed at Australin Open 2021, with a relatively easy draw and a medium-high seed secured at least until Wimbledon.
Conversely, if they decide players have to drop 2019 points at some point in 2020(HERE I tried to guess how it could work), Federer would have only 720 points at AO 2020.
Today, with 720 points, he would be #76 in the ranking.
With less tournaments played in 2020(Ex: No points from Wimbledon for everyone) rankings point would be lower overall, so he can probably be around #45-#50 in the world. But it's a safe prediction it would be unseeded.
And he have to defend all his ranking points in one tournament(Except some if he play tournaments like Doha or ATP Cup before), where he can play Nole or another top 10 in the first round.
The difference is huge in my opinion.