should be about his wins, first places, and games not elo points...right now it is very hard to beat him, and this is the most important thing.
one my club mate is running for rating, he draws, he escape tournaments when his elo performance gets in positive, he avoid matches where he can not advance his elo, he passed 2000 finally, I think he will catch even MC with this strategy mathematically, but he'll newer win on club's blitz, but who cares....!
If you look at Carlsen's results over the last years, you will see that 75% is possible. For exemple, he was at 75% from the second half of the Grand Slam in 2012 to the first half of the Candidates in 2013 when he broke Kasparov rating record :
5 games in the second half of the GS : +3 -0 =2
8 games in the London Classic : +4 -0 =4
13 games in Tata Steel : +7 -0 =6
first 7 games in the candidates : +3 -0 =4
(he then had two draws against Kramnik and Aronian, and lost against Ivanchuk)
Total : 33 games, +17 =16, 75.8%
If he renews his performance, he will reach 2900.