New sabo will be super balanced
New Sabo will be meta changing, but not game breaking. Compare new Sabotage to Flashlights. Both are ways to help a teammate to avoid getting hooked that require good timing and an item under most circumstances.
The only difference is that a successful sabotage has much more counter play. The Killer can drop the Survivor and they stay slugged, which much better than flashlights. Also, perks like Iron Grasp, Agitation and Mad Grit already exist to prevent sabotages and allow the Killer to reach multiple hooks.
And the biggest feature of new Sabotage is that it is heavily regulated. Toolboxes get drained really quickly and Saboteur has a long cooldown. It might be strong, but the Survivors will have their fun and then be unable to keep the pace.
I don’t even see a Killer running a perk to counter sabo builds having much issue. Mad Grit/Agitation would probably make Survivors stop trying to sabo for the rest of the game. Plus, you can slug and distract multiple people so botched sabo scenarios are easily cost survivors a lot of progress on gens and slow down games substantially.
It might seem scary and frustrating at first. But it won’t end up being that much of an issue just add more variety in playstyles and perks. The new sabo meta will finally make the rigid must-pick perk slots of Decisive and BBQ more flexible. Because those perks rely on getting hooked and new sabo will make slugging strats more viable.