Correct me if I'm wrong: when we talk about consensus, we mean consensus among the miners. And if the top mining pools agreed on another blocksize limit fork, the rest would probably follow. Correct?
Yes this is true; however it also requires at least the tacit approval of the individual miners who control the hash power. Then there is control over the nodes, code developers etc. My take is that this will require broad community consensus but in the end it will be the mining pools that have to implement it.