the largest secular growth market for performance-oriented chips
If mobile devices were really "performance oriented chips" then they would selling for a lot more than $16-$20 ASP to go into $200 to $500 devices.
The market has a pretty flexibile minimum requirement for CPU peformance and little upside to bringing more CPU performance to the table. Sales are mainly determined by non-CPU features and functions, device pricing, and system level costs (for smart phones especially those related to RF functions).
If Intel management had any unrealistic expectations for success in mobile it from was over-estimating the importance of the CPU side of things and not taking ancillary functionality and BOM level cost minimization by integration seriously enough.