While it's unfortunate that the Threes team didn't receive a proper recognition, I believe the popularity of 2048 mainly comes from the fact that it can be, in some sense, "finished" unlike Threes. Yes, you can continue after 2048, but it was a good milestone that is initially hard but can be done relatively easily once you've got the hang of it. The clear milestone makes every game play much more disposable unlike Threes, even though you can surely continue even after that. (I did play Threes a bit before 2048 got popular and realized this in retrospect.) The same principle applies to more recent Suika Game and I still find it amusing that the only major change for both was the title.