BA competes on frequency in the business market and the marginal cost of an additional frequency is much lower than the cost of setting up a new outstation. In the case of long haul at least when BA launches a new long haul route it tends to stick. Compare this to Delta which is forever chopping and changing its long haul route network.
The whole debate of BA and the regions really has been done to death. As yourself how many passengers on EK’s MAN-DXB services terminate at DXB and you have your answer as to why it wouldn’t work for BA.
EK may be a more expansive competitor than BA. However, it does not have the baggage of legacy carriers. BA management have at least now tackled head on most of the legacy issues and soundings are that there is to be renewed investment in the products and the brand.