Consensus of ideas? Who cares -- we will never achieve that. Consensus of the protocol? We already have consensus -- after all, there is only one blockchain. Now, if one wants to recklessly scale with tunnel vision of what scaling means (unequivocal, limitless or near-limitless block size), achieving protocol consensus is simple: maintain the status quo, ignore the reckless implementation until a reasonable approach makes itself apparent that will be supported by the miners. Everything else is speculative nonsense.