I'm sure he is aware of all the risks....I pretty much doubt he would just throw away the money for no apparent reason.
It's not as if it is going to be made into Heathrow Part 2 and I would only imagine selected scheduled flights as per the days of Air Wales....seems LCY or any of the London airports is popular with the locals. J41 to ATR size aircraft. We always had good passenger loads when Air Wales operated SWS-CWL-LCY, majority originating at SWS over CWL. He knows what he is doing and I say good luck all round.
Also as he has stated, if invested into then this would be beneficial for the football and rugby teams both for home and away matches.