Modifying the Bitcoin protocol to make it act and trade like cash, and still scale up "on blockchain", would best be served by forking DASH, and calling it Bitcoin CASH. These developers that want to just change the block size are missing the point. When Darkcoin forked the Bitcoin blockchain years ago, they went through all these growing pains, and determined the best route to 'on chain' scaling. After rebranding the name to DASH, their plan was set, and we now have the 'roadmap' letting us know how they will achieve 4000trans./sec by 2020.