Yeah, the advance in mobile technology has helped.
But like I said, it's been birth of the modern casual gamer (the one smart enough to buy off digital distribution). This new type of client does not only download games to his mobile, there's also Apple store for notebooks, desktop PCs, tablets, there's also PStore, there's Xbox Live, there's Steam.
And with the change of habits, moms, dads and sisters are now all loging in to these websites.
Like I said, that be the reason.