You get more active users as you progress through the levels.

Inactivity is only really an issue from levels 1-4, after then the 70 day rule deletes their team.

So if this were to be implemented, what would be considered an inactive team? Someone who doesn't log in for a few days or 2 weeks maybe? What if someone were to go on holiday for 2-3 weeks, return and find himself in a league full of rejected teams... Easy league for him and a free trophy.

Also in this inactive league, does promotion and Champions League rules apply?