They’ll need all the power they can get. Decentralization is coming for them. If they’re not all terrified they should be.
I'm assuming you are referring to mesh type networks, in which case the hurdle is not technological but rather legal and political.
Once a mesh network becomes a valid competitor , they will create and enforce laws to hold people responsible for traffic going through their devices (ie kiddie P0rn and other illegal activities) .
They will also create and enforce anti encryption laws to prevent that as a loophole.
The challenge for mesh or decentralized networks will not be technical, it will legal and political which doesn't end well for the consumer.