I'm fine where I am. Any online game is only what the players make of it, so I just choose to be positive or not play at all.
There are a lot of practical reasons why your idea wouldn't work, but even them aside I don't think you would get your desired effect. Even in a league where every team has an active human manager, you will find it can be very quiet as well. Some managers don't like to interact, many only log on a few minutes a week, managers are always quitting and new ones take their places, especially in lower leagues.
Of course it would be nice to be in a league with 15 super active people who's life revolves around the game (well maybe not that nice), but it's just a utopian ideal that wouldn't happen no matter how you group the countries.