Nah. The Slann protected them. Granted, the Slann got decimated in the process, but the Lizardmen survived.
I think the Lizardmen will be sticking around in Warhammer, but they probably wanted to ditch the Slann since they're all resin models and are the only non-lizard-folk models in the army. If that doesn't affect the army's balance in-game, I think most Lizardmen players will be fine with that, as long as they get to keep playing with their dinosaurs.