Everybody thought NCP's 8 bit host ids were enough, until TCP/IP happened. Then everybody thought OSI was going to take over and rule the world, until TCP/IP didn't stop happening. And then everybody though IPV6 would quickly take over, until IPV4 refused to die. And everybody thought the world was going to run on SGML, until HTML happened. And then everybody thought SGML might rise from the dead until XML happened. And then everybody thought XML would never just go away and die, until JSON happened. Just goes to show, you never know!