$newThing: Hey look, we have a shiny new thing!
$newUsers: Ooh, shiny!
$newUsers: *flock to $newThing*
$oldThing: Hmm, we're not getting new users these days. I know! We need to be more like $newThing!
$oldThing: *Changes everything*
$newUsers: *Continue flocking to $newThing, because that's what everyone else is using*
$oldUsers: *Abandon $oldThing, because it no longer does what it used to do*
$oldThing: Why are we losing users instead of gaining them?
For $newThing and $oldThing think, say, Chrome and Firefox, or Facebook/Twitter/Tumblr and everything that isn't Facebook/Twitter/Tumblr.