For the best part of the year, cricket is a country versus country phenomenon, and for dyed-in-the-wool fans, Australia versus England or India versus South Africa or Pakistan versus Sri Lanka is still what holds the most interest, depending on where you come from. There's already a rich tradition of a second layer through domestic cricket, and for a Yorkshireman, the Roses game against Lancashire might even trump a Test match. In India, the Mumbai-Delhi Ranji Trophy rivalry is a many storied one, even if it's running out of puff a bit in recent times.
The introduction of the Indian Premier League has added another undercurrent, with city-based loyalties developing.
The fact of the matter, however, is that cricket has always provided some unusual and interesting matches. In fact, games such as Smokers versus Non Smokers, Bachelors versus Married Men, North of the Thames versus South of the Thames were routinely awarded first-class status in England in the early 20th century.