my friend pointed out that the best thing about this hobby is that there is no definitive answer on what is the "best." even when you reach the end-game, there is something out there that may not be "better" but at least different. plus, that all lends to lively discussions on what is the best.
There is a reason why I haven't seen the Definitive List of Headphones, amps, sources etc ranked in order of greatness. Because there isn't one. If there was, we'd all sell our worldy possessions, get the consensus best of everything, then sit in our forclosed shelters and listen all day and not post anymore except to say *are you enjoying this? yep i am too!*
so head-fi will always have something to talk about, educate, debate etc. and just wait until there is a technological breakthough (and no it isn't those Bose Noise Cancellation cans) to bring a new crop of gear to the fray.