MMP means “more meddlesome parties”. So some think who want shot of mixed-member proportional voting so the big old parties can have a freer hand. But this election the small party in the spotlight does not depend on proportional votes.
The Maori party, which might be the pivot in post-election negotiations, wins electorate seats, not list seats, so it doesn’t depend on MMP. In fact, those seats could be pivotal even under first past the post (FPP): in 1946-69 and in 1957-60 the then four Maori seats were critical to Labour governments’ majorities.