Virtual data on the internet that currently we take granted for could cease to exist later on, so collecting these data is not worthless at all. There exists many lost media even in the age of internet.
With that said, collectibles that only takes a server to mark "you have it" truly are worthless.
As long as it requires a server to operate, then yes, it will go away one day. That it failed to turn a profit even before the economic downturn, according to that Reuters article they cite, doesn't inspire a lot of confidence that it's going to run for very long.