New Zealand done some better in last few years but still they need more time because first they were mostly losing in semifinals now they have habit of losing in finals so losing three finals in 6 years really matter of worry but still good thing they were able to win test championship against team like India.
I think New Zealand needs to find some really hard-hitting batsmen for their one-day and t20 squad. I know they have that type of player but if you don't score in the depth overs, u can't win in t20 and also in ODI in some cases. And their whole batting order needs to be more strengthened. Because Cricket is becoming a game of batsmen day by day.
I feel NZ has best batsmen now in the line and the last match was fantastic. I feel the bowlers have to be looked at. Need to bring in few more best spinners who is more capable of taking more wickets. What I observed in the final match is, NZ players missed few catches which led them really loose the match. Warner and Marsh were on fire. If NZ had controlled the runs and caught the wickets came in, they would have been the winner as the score 170 plus was not easily chase-able in finals.
My strong belief for the winning of Australia against New Zealand is the ground. Dubai grounds are much supportive for second batting. This has been experienced throughout the tournament.