If they can get away with it, it’s because they have a product where quality doesn’t matter. If you want to see everything outsourced, “ organization or radicalization that would be required to push back against this” seems like the way to go.
An effective and sufficient level of organization would allow workers to tilt the balance of costs definitively against outsourcing. Employers are also only able to get away with it because the ones who are not laid off are willing to play along (understandably, since they are each individually in a similarly precarious position, but this creates a tragedy of the commons when everyone applies the same calculus of risks).