From a Tower point of view it's difficult to see that this will have much of an impact on the arrival or departure rate.
There are a few hidden gems,like now requiring two minutes dep separation behind a340's due to their performance relative to other heavies. Also if everything is going to fly the SID there will be a bit more space required behind the Ranbi turboprops that used to benefit from a right turn to clear the climb out. Free flow of Ranbi deps from Sharjah can only mean delaying a Ranbi dep from Dubai.
Maybe it will be better than us Tower guys imagine but none of us have had sim time or training of any kind on this so the first few days should be a pretty steep learning curve.