At least, not to me it isn't. Over the past year and a half since I've been running our local hobby league, I've met some great people and made some even better friends. Having spoken with a few of them, I know that the game won't die for us. Granted, some players will move on to other games, or just stop playing as their interest shifts to other things. That's natural and happens in all facets of life.
As for me, I plan to continue collecting cards, finish my sets, and build decks for as long as I can find people to play against. We'll run events for as long as players want to join in them, and I'll do my best to continue providing prizes for as long as possible.
Vs System is a great game, and I'm going to keep playing. So should you.