It could probably go either way, depending on a number of factors. A long waiting period could theoretically make people want to get the game even more as the hype for it can build up constantly over a long period of time. However, the wait can just as easily kill the hype, especially if the developer doesn't give frequent updates on the game's progress.

Other factors could be the announcements of other titles overshadowing the game, people simply forgetting the game after a while, the eventual quality of the game and whether it actually lives up to the extended hype, and various other things that can have an effect on sales.

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