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Why would that occur? For a start - it's in all likelihood impossible to do that within current BB structures.
There are a few ways you could structure this...
Let's say - for ease - only one super league in Asia - a conglomerate of: Sth Korea, Thailand, Japan, Vietnam (again reiterating: this is for example's sake).
You could...
[1]- have direct relegation/promotion based on nation (lowest finisher relegates, regardless).
[2]- make it simply on ranking, disregarding nation entirely, but drawing on those 4 to provide the highest world rankings in that region - they play in the Div 1.
[3]- Have a relegation game during the playoffs, where lowest Div 1 team per nation plays against a team that would promote - winner goes/stays in Div 1.
Lots of ways that national identity could occur, without going the Utopian route.
That are some valid ideas.
[1] could work in merged leagues with less than 4-6 countries. If you merge more countries you would have to many teams that are in relegation/demote. However we could have very weird scenarios where a high ranked team demotes just because the other team of his nation is even higher. Still I think this in combination with [3] is the way to go IF such a superleague would be implemented.
two problems this idea does not target are:
-managers of smaller countries would have it easier to promote to the superleague because of weaker competition in the highest national league. a guy, who has been champion for many seasons in his country in the old system, could just stay in the regional/continential league forever in your system, because he would always win the relegation game against very weak opponents.
- new managers would still have very few competition on the same level if they only start with other users from the same country (which would be in many cases equal starting alone!). If you also merge lower leagues new managers would start together with the few new managers other micronations have. This is in my opinion the most important benefit of a merge.
please don't ignore my arguments just because I play in a large nation (which would be ad hominem, too) and think about it ;)