I'm not sure how this has happened with this thread being kicked off by the source of 86.5% of pro-New Zealand sentiment on TRF and somehow turned into the delicious chance to stick a knife in the NZRFU's back. 
The obvious knee-jerk reactions here are most patently incorrect in their assertions.
The NZRFU has NOT THREATENED ANYTHING. A threat suggests malice.
The NZRFU will not likely be able to incur a loss in revenue which will likely be greater than the $13 Million they would lose through a lack of an extra round of Tri-Nations, sponsorship and promotions. In that case they'd be unable to attend the next World Cup.
If it happens again next time to the degree discussed, the NZRFU may go into some form of financial collapse and may bankrupt itself. That's what Tew is worried about.
It's not greed, it's not threats, it's a potential financial reality!
What would they do instead, with no-one to play if the unthinkable happened and they couldn't afford to be there? It'd never go this far but for arguments sake probably an internal tour. Having the AB's playing some of the provincial sides with everyone other than them available would be a once-in-a-lifetime opportunity of uniqueness that would allow them to make some money, as I think if the All Blacks turned out to play the Crusaders at the "by then hopefully up and running new Canterbury stadium" people would flock to it for the unique chance to beat the All Blacks with their local teams.
Maybe the AB's versus the North Island and South Island in a triangular series? :lol:
As I'm saying though, I'm sure common sense will prevail and there will be probably be some kind of decision which will enable the unions that are out of pocket to cease losing money.