First of all, it is only for the LOCAL (as in NZ) and FREE TO AIR broadcasting rights. Sky will still do all the games and, one presumes, the international broadcasting feed.
At first I was opposed to the MTV bid, but then I realised I couldn't think of a good reason really beyond a reflexive bit of wishful thinking that TVNZ could still actually be the state broadcaster.
The reality is though MTV is now the "local" broadcaster. TVNZ has completely lost the plot, and should be sold and left to slower sink into irrelevance. I've heard some MTV rugby league broadcasts in Maori, and they sound a lot more excited and engaged than the funereal Sky commentary team.