Arm exists because they went after a market Intel didn't care about. Intel was slow to react to the shift in market, but they have reacted and they are focused now. It is only a matter of time before Intel dominates the market. Their latest Atom processors are already better than Arms. They may not get the same cut from mobile processors, but they will have larger volume and there is an emerging market in the hybrid tablet space. The Surface Pro is considered a tablet but it still has an i5 in it. If Microsoft didn't screw it up so much it could have been a huge success.
If any company can touch Intel fabrication process, then maybe I will start to be worried about my Intel stock.