I think we can finally rely on other spinners and Shakib won't have to be depended upon with his bowling. To me, that's a huge step. We can't just rely on him to be our best bowler and batsman. Something had to give and I think it's best he plays more of a support role in bowling. Let Razzak and Gazi have the bowling workload for T20I's and ODI's and let Sunny and Gazi do their thing in Tests.
Like I've said many times before, rather than having him at #5, it's time we bring him in at #3 or #4 for all formats of the game. I feel this would be the best way to use Shakib and not over rely on him.