The fact that Bank Emirates NBD takes over Dubai Bank is more likely not ot have an impact in the Gulf Arab region. Although it's not a common merger, it is a handover arranged by the state.
Although seen as overbanked, the UAE takes rare steps towards consolidation. Emirates NBD is the result of a merger dating back to 2007 between Emirates Bank International and National Bank of Dubai. This was the last time when a bank in in the Gulf state bought a competitor or merged with one of its rival.