Surely this is not bad idea at all because this can bring some more interest good viewership even New Zealand is not cricket lover country Rugby is first love for them but with these two teams they can take some good advantages in many ways like USA enjoying with Canadians in few leagues like NBA, MLB, NHL and MLS these have just 2 or 3 teams from Canada but some very big profit is coming for them.
The idea is good, but arranging the transportation and logistics can be very challenging. For example, Perth is located some 5,000 km away from Christchurch. Do you expect the players to travel all this distance several times a week? One option would be to stage a few initial rounds in New Zealand, and the remaining matches in Australia. But then, how many New Zealanders would purchase tickets to watch Hobart Hurricanes taking on Adelaide Strikers? Or how many Australians would do the same for a match between Auckland and Christchurch? The gate collections may get affected.