I think it is still the lack of integration which holds off Intel's success in mobile. I don't know what makes them take so many years to integrate a modem - it kind of sounds ridiculous. Big Intel can't integrate its own (!) modem within years of development. That's confusing, to say the least.
In any case, when they finally start executing, they are competitive in that space. I have no reason to doubt it. Yes, tick tock won't be enough and they may still struggle in the higher end but they have a much better cost position, at least in theory. Once they finally start to use it, they will penetrate the market and weaken the ARM ecosystem. Intel's army of engineers has to finally deliver, it's really unbelievable for me how much they failed in the past. I don't think it is a lack of capability, though.