This is an interesting development because it's the first time WW has said 'We don't think this should happen' as opposed to 'We don't believe this will happen'.
HAL doesn't really have any money itself. There are only two sources of funding--- taxpayers or travellers. Unless the vast majority is traveller funded the project won't happen. It is up to the CAA and the Government to confirm Davies's conclusion that the project is specified correctly and that it's worth £10 extra per traveller to HAL for ever.
There is going to be ferocious lobbying on that question, among others, over the next few months.