Someone, it may have been Gary Holt or Scott Ian, mentioned that Pearl Jam tried doing a tour without LN and it was basically impossible. Live Nation owns or is a major stakeholder in 76 clubs and venues around the US. I don't know if it will affect Tool so much as it will affect the smaller to mid-sized bands that aren't a headliner. I'd bet though the guys in Tool aren't happy about it, much like every other artist.