Because it's not ARM who has done the stealing. If the iPad was ugly and had a cumbersome input method and shitty software, ARM wouldn't have saved it in any way.
And Intel isn't making tablets or tablet OSes but you're still attributing market success to them.
Here's the problem. If the mobile market is actually highly lucrative and it affects Intel's bottom line, they can and will adjust their business model to the market's needs. ARM on the other hand cannot ever get to the same level as Intel on the technological front.
Things are changing in Intel's favor on both aspects.
That's a nice theory, but until Intel shows actual willingness to license their IP it doesn't amount to much.
However, let's say they change to this. That means one of two things: either Intel is offering their low-power CPUs as IP that can be manufactured in another fab or they offer their fabs for outside utilization (perhaps with the stipulation that it must be built around an x86 core they're offering).
In the first scenario they not only lose their fab advantage but have to start over in optimizing their IP for other fabs (or need to get third party companies to do so, or the licensing parties need to do it themselves). This takes time.
In the second scenario everyone else has to port their stuff to Intel's fabs, and Intel probably has a lot of work ahead of them providing their tools and getting people to learn how to use them.
Either way is tricky for Intel because to make these solutions viable to the industry it has to cost less to license than to buy Intel's own chips. Therefore Intel is at the very least losing money vs selling chips and at worst creating competition against their chips. So long as there are markets where it's more profitable for them to sell instead of license they'll risk having to compromise.
You hint that SoC flexibility no longer matters because it's well established what a tablet/smartphone SoC contains and Intel is making just that. The problem is that Apple isn't content with such "standard" SoCs. Take for example A5X in iPad 3. It dedicates a huge amount of die space to delivering best of class graphics. Clovertrail, Intel's suitable tablet response, offers nowhere close to this capability despite being a substantially newer chip on a better process - Apple's 32nm A6X coming out pretty soon will greatly leap over it once again.
The reason why Apple can afford to make these big SoCs that they're only putting in tablets is because they have not just the tablet volume but the revenue per tablet. It's a much harder sale to negotiate a custom high-GPU performance design from Intel, specifically for Apple, because they'd make far less money from doing so.
So you can see how Apple benefits from being able to either license or design in-house everything that goes into their SoC.
So, coins instead of notes? :sneaky:
Seriously now, I don't think iPads will use Intel chips by then either. But I do expect the competition to deliver some worthy devices with Windows 8 capable of running a range of desktop applications. And that means ARM's superficial market lead starts to crumble. Apple is slowly but surely losing its dominant grip on the form factors they first introduced.
Okay, I guess let's look at the market in like a year and see how much market Windows 8 tablets have taken from Apple and other ARM-based tablets. I for one don't think desktop apps are going to be a big push at all.
I don't know about Apple losing their grip but so far there's zero indication that they're losing it to x86 devices, so it's all speculation on your part.