I think they'd have to come up with a division of four out here in Europe, and another division of four elsewhere (Canada/Mexico/US). That would give you 40 teams, 20 per conference, 5 divisions of 4 in each. Playoffs would be 5 division winners and 3 wild cards- straightforward playoffs of 1v8, 2v7, 3v6 and so on.... By doing this at the least you ensure that 2 of the 8 expansion teams get to the playoffs in any given year.