None of this means anything.
This means nothing. First the flash will get somewhat faster but as you note even USB is fast enough. It is the abilities beyond the flash interface that makes TB interesting on iPhone.
The current iPhone chips don't. That doesn't mean that future device can't. Realistically all they need is a bridge from one of ARMs internal buses to PCI -Express.It won't be Thunderbolt. Thunderbolt is PCI-Express, no part of the iPhone uses PCI-E,
That is also a current problem but again means nothing in the future.plus the TB chip is about half the width and depth of the iPhone.
Doing that would be grossly stupid when they have much faster ARM buses they can attach a bridge to internally on the chip.Apple would have to convert the USB signals generated by the ARM chip into PCI-E.
That is a problem but you make a huge mistake here thinking that the goal is for this to be the Normal interface on the iPhone. The USB interface would still be there. What this would give the iPhone is the ability to drive video screens and projectors, networking cards, docks and other assorted devices that the current dock has limited capacity to do.Also, going on existing prices, the cheap $2 "iPod" cable would cost about $50.
USB 3 would be somewhat pointless too, as it's not USB that's the bottleneck when syncing the iPhone, it's the slow NAND flash.
This means nothing. First the flash will get somewhat faster but as you note even USB is fast enough. It is the abilities beyond the flash interface that makes TB interesting on iPhone.