not more than 2 matches in NZ
5 are gonna be too much in my view..
4 for Eng/Aus/Ind/SA
3 for SL/Pak
2 for WI/Zim/NZ
1 for Bangladesh
How about doing tours instead of Test series only? I mean, it will not only add to the story line but also let you keep your sanity
Too much test cricket might turn boring after a while and we sure don't want that to happen.
Moreover, by playing all 3 or at least 2 formats, we can distinguish between the limited-over specialists and the not-so-agile test players.
All in all, everyone gets a chance to be a part of this story.