Are you someone on the development team for Android ? If not, then that is only your subjective opinion. The plethora of evidence to the contrary is quite against you though, with all the handsets that do not have that form factor at all.
And since when did it become the "iPhone" form factor ?
Circa 2002 :
TBH, those really aren't that great of examples of what would be a form factor by definition. They are great examples of the concept of a minimalistic phone (regarding available buttons) with a large touchscreen. That said, I do agree with the overall point you are discussing, and think the best, and most obvious example of a device in that form factor, would be that of the Prada, and possibly your first example the Sony.
In overall fairness, a similar question you had asked DeathChill could be asked regarding the concept and design of either the Prada, or iPhone;
Was someone at LG aware of the pending release of the iphone, and used the larger flexibility of their company to come to market with a device first? Rumors of an Apple phone came long before it's initial debut, and it is entirely possible that they contacted LG to discuss screen manufacturing for such a device.
The Flipside is entirely possible too; While visiting LG to discuss screens for the iPhone (or other products), did an Apple exec see a drawing, or possibly a prototype of the Prada phone, and decided to move their secret phone project in that route?
Which one is the chicken, or the egg? I doubt we will ever know. But as has been stated here, the form factor was definitely an eventuality.
One piece of interesting kit from history, the IBM Simon. It doesn't fit the form factor, however the concept of a primarily Touchscreen only phone came to light back in 1992. A time when cell phones were hardly in everybody's pocket.
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