What would be a death blow then?

Trainspotters and lovers of spending other?peoples?money like to make claims, more frequent of lat, that we need commuter trains between Hamilton and Auckland:

KiwiRail has cancelled Hamilton train services to this weekend’s Rugby World Cup quarter-finals in Auckland after selling only 23 tickets for commuters going to both matches.

But a spokesman advocating commuter trains between Hamilton and Auckland says the canning and lack of demand is not a death blow for the proposed rail service.

If bugger all people wanting to pay for s ervice isn;t the death blow then what on earth is?