You maybe right, however business 'sense' isn't about making life easier, only in making money.

In the South East currently there is far more demand for services than can ever hoped to be met by the current infrastructure, and if you travel by train ever, you can see this first hand. Government and businesses response to this has not been to make new lines, increase capacities of trains and lines existing, but merely to put the prices up, which effectively keeps more people off the network.

Businesses' first and only priority is profit and currently the railways in the South East can make enormous profits by keeping prices sky-high, useage at a contained maximum and doing the exact opposite of what's actually needed, i.e. new lines and greater capacity.

I am sure that if the case for profit for any line in the area is overwhelming than it will become a reality, but at the moment, the profits to be gained simply aren't big enough for these schemes to work.....YET and I see no reason for that to change in the short term.