as a new zealander i think this is a pretty good idea (ignoring the logitistics) though i can identify with seamers concerns in that i think NZ cricket has more to gain from this than Oz do. NZ batsmen will get used to fast bowlers on fast pitches (and beamers - hahaha), spinners on spinning strips and generally raise their game. you could argue that Oz players would get used to playing cricket in the rain on pitches which have had the groundwater pumped off them and dried out by a helicopter the day before - but i understand that's not really too different from bellereive . . .

i know nothing about the domestic game in Oz apart from the names of hte teams so don't know how easy it would be to schedule in two extra rounds to each competition. also, i think the point about the dilution of the Oz compitetion is pretty valid - especially given NZ's form at the moment - i'm not sure if they could scrape together two competitive teams

currently NZ only split their cricket into Nth vs Sth for one one day game a season. it may be practical at first to create (yet) another competition (schedules willing) playing only one day games between the seven + two states in a 'super 12' style replica, i don't know

i expect it will happen one day (once kerry packer buys new zealand or something) as the two countries are more similar than they are different - much as we hate to admit it.