The article that I read implied that the ban wouldn't affect contracts already signed, since California teams would have to forfeit those games and pay appropriate penalties. That impact would be down the road. However, bowl games and presumably NCAA playoff games could be affected.
and, will California state schools no longer be able to recruit the states of Alabama, Kentucky, South Dakota, Texas, Mississippi, Tennessee, Kansas, and North Carolina? Or, only by phone? Just a quick scan of UCLA's roster, I counted around 10 kids from the states in question, mostly from Texas.
The schools have more control over which bowl game they play in compared to NCAA championship playoffs. Right off the top, UCLA and Cal wouldn't be able to play in the Sun Bowl vs. ACC teams since the game is in El Paso, TX.