That might be so EESDL but, I suggest that, even if the British government had been able to create a new from scratch London airport in the 1980s or 1990s - it would still be out of date today. The security issues (real or imagined the impact is the same) and the criss-cross of routing - not forgetting that everyone now wants the txfer to be lightning fast and hassle free, whilst taking their large carry-on?
Every pax wants everything and for a lower price - somewhere they will be dissapointed.