No one is stopping anyone supplying flights outside of London. The hub and spoke system for long haul traffic is a global one. The short haul model is loco and the regions are well served by this.
My life is micromanaged enough as it is without the government telling airlines to move their operations to the regions. They fly to where they can make the most money. END OF. Success attracts success, and if the UKs world hub is truncated, then the traffic will move to CDG, FRA or AMS long before they tinker with LBA or LPL. Please get real.
It's a business, not a social service. This is why LGW just lost Oman Air, the latest of many to make the move to LHR. It's a reasonably free market. I suggest you write to flyglobepan, they tried some long haul from the regions recently. It wasn't a great success.....