I've no idea cause I left the blank lineup only 2/3 times but I think nothing should change excluding that finally you've to play :)
I think you're right.
Those too lazy to set a lineup will adapt.
Those who thought leaving a lineup blank was the best way to win will adapt.
Those who just whined about it for whining sake will find something else to whine about.
Those who said blank lineups made people leave the game will say that
eliminating blank lineups will make people leave. To them, the sky is still falling.
Sometimes, the more things change the more things stay the same.