....and where will the money come from?
1695m is certainly big enough to accomodate most business type jets and turbo prop aircraft presently used on scheduled services in the UK, but it's nowhere near the length of runway required by the vast majority of large jet operators, they would have to have a 2000m runway to have any chance of being a serious player in the commercial market.
Additionally, new lighting, approach aids, taxiways, proper levels of staffing in all areas to handle the traffic, not to mention improved road access, would be required.
An investment of 10s of millions of £s is required, which I suspect that the owners and developers haven't got and don't have a hope in hell of raising.
Perhaps they should stick to what they've got and Blackpool rock.