A protocol where anybody can set up a connection and get compensated for transmitting data. The major ISPs will still exist and function within the protocol, but in the case where they decide not to service anyone (For some reason…) then internet traffic can automatically switch over to transmitting through small scale routes. In a pinch, even a wireless router like the one in your home can transmit packages between people.
So yeah, basically a meshnet. The only difference is that people will be incentivized to run high-quality connections between far away nodes on the mesh, limiting the worst parts of being on a meshnet.