Well i guess I pass through the airport around 20 times a month on my way to taking a seat in the VCR so i'll have to respectfully disagree with your assertions. Whilst some of the highest hourly movement rates are at night we are not operating at full capacity from 8pm-8am, far from it. The nightly peaks are matched by the morning rush hours.
As far as Rwy capacity goes we have the luxury of being able to use single Rwy ops for 3 to 4 hours every day so again plenty of capacity available there too. You mention "DXB as it stands" but you miss the point, DXB doesn't just stand, it is constantly working to increase capacity and handle the continuous monthly growth. I'm sure you have the actual figures somewhere but i'd be very surprised if the number of new airframes which will be based here by both FlyDubai and Emirates in the next 12 months is less than 30.
As regards DWC being "Squeezed" by 48 A/C, don't worry they'll be ready for it when it happens.