iGlass will probably be created by Apple or a hardware startup led by some people like Steve Jobs and Woz. No software company has made a hugely successful hardware product.
XBox seems to be stuck at ~breakeven over the entire lifecycle. They have spent several billion on advertising, they generally sell the console for a direct loss, and it's PS2/3/4 have each sold significantly more each generation.
So, IMO it's not hugely successful just not out an outright failure.
That said, they have shipped a lot of hardware over time, and made some reasonable profit from mice / keyboards.
