It's the old risk V reward thing.
At the moment, the Emirates Utilities Allowence for FOs would cover a VERY nice 1 or 2 BR apartment in a nice part of town (such as the marina), with some to spare to cover expenses.
SO the questions are:-
1) will rents and expenses rise AND
2) Will the EK allowence fall?
Rents are stable or falling at the moment. No idea how long that will last- probably the next 3+ years. After that who knows?
EK allowence? No actual indication EK are consdering reducing it, but as it now clearly outstrips the value of EK provided accomodation, who knows if they will choose to reduce it?
Opting out has higher risk with potentially higher reward. What you choose is up to your individual taste in terms of risk.