To be fair, the difference between this and 'some variation on this' is also the difference between the iPhone and Windows Mobile 6.
Are wearable computers going to be a thing? Probably. But if it does become a thing, Apple will make it one, not Google. Here is this product segment that is, by necessity, the intersection between computers and fashion accessories. Only Apple has the mind-share to pull that off.
why do you think that? Have you seen the latest market share of smartphones? Android?