this is not them leaving their respective leagues, its leaving champions league and forming their own tourney. One where UEFA (FIFA) doesnt take most of the money. The money goes to the clubs and the player.
yes there seems to be some confusion. The teams are not leaving their leagues they just dont want to play the UEFA champions league. instead midweek games will be in their new superleague. Now if the local FA's and leagues are cool with it is another matter.