If your goal is to unify emojis (or reduce variation in emoji), and you create an entirely new set of open source emojis different to other sets of more widely used open source emojis, you have increased variation rather than reduced it.
The xkcd works because unless everyone is willing to adopt the new standard, then you further fragment the market. There is zero evidence that the dominant players want to converge here (except maybe if everyone adopts their design!).
The xkcd works because unless everyone is willing to adopt the new standard, then you further fragment the market. There is zero evidence that the dominant players want to converge here (except maybe if everyone adopts their design!).