What would happen if Tetris never existed?

That's a rhetorical question. There isn't really any answer to it. One thing for sure is that there would be many tetris-based games that wouldn't exist either, but the impact it would have on human kind isn't much at all. That is unless there would be someone who's life consisted of Tetris. The only thing that is for sure that would be changed, is that there would be many tetris-based games that would no longer exist, and also people who hold the record for most points in the game would no longer have that record. But that's really about it.