and this answer about the last version of BIP100I can agree with this. It is true that EC is uncertainty.Businesses can agree on giving more blocks size, butIt can be a good idea to have a more large range of time before enabling a new block size.A miner/pool can request a new block size with a coinbase message. (so it isn't limited to the 5% of BIP100, it can be lower or higher)If the other miners will agree with another coinbase-message-agreement for the next 75% of the next 2016, that nodes will start accepting this new size.2016 blocks are even good for the miners to see how the market is reacting on their request/proposal.