I wish you were right, but if we take a look at the actual die sizes
http://www.anandtech.com/show/5876/the-rest-of-the-ivy-bridge-die-sizes
http://www.anandtech.com/show/6330/the-iphone-5-review/4
You can see that just isn't the case. Meanwhile, you're getting the entire package with the SoC while you only get the on-die GPU + CPU for the Ivy H-2/M-2.
The issue here isn't die size, it's the cost attributed to it. For Intel, they still believe that charging consumers an x86 tax is going to work yet they're neglecting their sales figures which show that, while it may have worked before, it's changing.
If Intel really meant to take on ARM tablets with Ultrabooks, they'd have priced them accordingly. OEMs are operating at sub-7% margins for Ultrabooks. While they offer better performance, people don't care for them nor will pay the inflated price tags.
Instead of directly decreasing prices for the chips:
- Intel attempted to standardize plastics for the chassis so OEMs don't have to use magnesium/aluminum allows. That failed miserably
- standardizing an mSATA form factor
- allowed a very vague description of Ultrabooks (5lb weight, 15.6" size, 5k RPM drives with small cache, etc.)
- standardizing batteries
- marketing
Only the marketing affects Intel's pockets directly, while the others are meant to alleviate the very low margins on OEMs. Basically, Intel is willing to decrease the quality of an Ultrabook and make it less appealing to consumers so long as they get to keep their sky high prices on their chips for said Ultrabooks.
Haswell changes only some of this, in that it's made specifically for that TDP range. This should mean we see far less throttling under load and better performance, but if you believe the rumors, the prices have also gone up. Although throttling was clearly an issue, the biggest detractor is still the price and that's looking like it's going to be even worse.