My reason to play with second team will be challenging my self. Try to get to the highest level and so on. Finland is quite small so I do not miss any micronations. My choice would have been the biggest and most competitive countries for second team.
Now when solution will be Utopia, I think that there will not be as many teams as in the biggest countries. I hope there will be much more teams than in Finland, but I'm afraid that Utopia will not grow as big as I would like. Good thing is that all managers are experienced so competition will be hard there

Another "problem" in creating new country "Utopia" is that if economy and division structure is based on current model, then those who are lucky and will get team directly from top level will get very huge financial advantage compared to those who will get team from lower divisions (tv, tickets, fan income). If you check early seasons from your own country, I think those teams who were directly in top league, they have dominated quite long time in new countries.... So how to motivate those managers who will get team e.g. from D IV.
Hopefully all teams are put into active divisions....meaning that lowest level will be fulfilled starting from n.1 then next 16 teams to n.2 and so on....not so that teams to lowest level are put into different divisions to fight against bots. Also relegations should be handled a bit differently.....