FlightpathOBN,
If you look at the queue with wake separation, a blended queue could easily give you 25% more capacity, especially when coupled with ground ops...
What do you mean by a blended queue?
What do you mean by ground ops? How could that increase capacity?
I assume you're aware of the work ongoing around Europe of time based arrival spacing and thence pair wise separation, but that's a long term initiative, it's not going to happen overnight.