T20 is THE ONLY format where, may be he can stay in his position for the time being.
Let me explain why - what I understand is 90% of his selection merit these days is his Brearly like Captaincy. PAK is probably 6th in Test ranks, 7th in ODI (hopefully should go to 8 by end of Jan), means the team is poor - you can't hide MJ Brearley in that XI.
But, in T20 it's quite a formidable unit and team can accommodate one such inspirational dynamic leader. In T20, you don't need 6/7 batsmen - Sarf can easily drop himself down one by one after Imad, Shadab, Fahim, Hasan, even Amir and it'll be beneficiary for the team as well. His batting will be required only if PAK is 40-5 in a T20 game, which if happens regularly, PAK won't be among top 2/3 ranks in short time. Besides, I am not sure if you are familiar with Baseball, but in T20, WK's role isn't much different from 1st baseman - 120 balls, may be 1 snick, and one stumping chance.... he won't do much damage, unless it's of like Butlar, AB, Gayle, Munro, Maxi .......
ODI is the most complex game and PAK is weakest there - can't carry even Mike Brearley's Mentor.