Intel went into some depth on this in their quarterly conference.
From Krzanich:
The PC Client Group was down 4% for the year, but the business began and stabilized and actually grew a bit in the fourth quarter achieving all-time records of i5 and i7 unit shipments. The desktop business was particularly strong in Q4 growing 11% over last year.
One can only conclude from this that lower end laptop sales dropped in volumes, but that's why Bay Trail is so important. HP and Asus are showing that you can build a compelling $499 2-in-1 PC, which is an amazing value prop compared to the hot, large, and heavy laptop clunkers that represented last year's $499 models.
And it sounds like the desktop market may have already stabilized.
Intel needs another growth avenue that leverages its core competencies.
the problem is that once you cross over into the cellular world..you're not in your core competency anymore (which in my mind for Intel is powerful processors manufactured with leading edge processes).