The problem Intel faces is not from tablets, but from smartphones. The ARM spec is getting lots of attention, and it is only a matter of time before it arrives into a notebook or desktop. Intel was able to overtake the computer market starting with the humble desktop, and build from there to be in servers and super computers. Now the story can happen again, and Intel is aware of that.
More technically, Intel has to be honest with itself and drop old tech from its chips. Hyperthreading, branching and other trick built for single core chips are obsolete (IMO) in the era of multi-core computing. And it is hard to drop tech after putting billions in R&D. ARM, and Nvidia"s GPU architecture look streamlined, straightforward, and easier to scale.