ARM is hardly a competitor for Intel. Are they both aiming to be same devices, even on mobile platform? Isn't it a question of software that runs on both systems? The versatility of ARM is topic hardly answered by Intel in terms of infrastructure. Nor Intel is able to provide different options for system-on-chip platforms. Moreover, Intel domination is limited only by x86 instruction set platform, in which AMD suffers too its own share.
Is ARM going to expand its offerings into PC market? Stepping into high performance market it would certainly mean so. The limitations which Intel guards closely for x86 instruction set will not be able to hinder ARM in the same way. ARM is totally new chip, being cheap and having Android/Linux platform as backing.
Same ARM platforms are currently being integrated in various Asian make TVs, which come with equal or higher performing graphics chips than found in tablets! In case of TV, which can be converted to a monitor it would mean that a whole computer can be integrated in same case. Further, it would mean ready to use Android/Linux platform similar to PC.
Intel does not step out of its boundaries which are strictly defined by x86 instruction set: PC and server hardware. ARM does not have limitations like this. Moreover, ARM is not company that manufactures chips, however is a patent company that sells architecture information to various chip companies such as Atmel or Samsung. Which in turn make ARM chips not only for industrial use, but for hobby use as well! Hence popularity of ARM chips among younger generation of programmers! Beat that Intel!