The way I've been looking at it since well before Christmas is that the aim should be 90 points - a figure which has never failed to land the title before (someone did once fail with 89, and it was brilliant!). That gives us quite a lot of leeway for poor results caused by rotation, fatigue and injuries.
As it stands after the WBA game, to reach the 90 mark, we need another 22 points, so 6 wins, four draws and three defeats from the last 13 matches. In other words, we don't even have to win half our games.
Of the other teams, only United can now reach 90. They'd need to win 12 and draw the other of their remaining games, but would need to overhaul a goal difference disadvantage of 24 as well.
Someone posted on Twitter that, to reach 96 points (which would set a new PL record), we can afford to draw one and lose three of our remaining games.