Will The iPhone Allow Apple To Capture All Three Screens?

Bill Day at BillDay.com ponders the possibility that the iPhone will allow Apple to capture all three screens -- the desktop, the TV, and the mobile phone. Right now Apple looks pretty well-positioned for an integrated multimedia platform: The Mac is strong, iTunes is still dominant, Apple has launched Apple TV, and in June the iPhone will complete the company's offerings.Microsoft has had a similar opportunity to capture all three screens for a while. As Day points out:

One could argue that Microsoft has a similar chance with Windows, Xbox 360, and Windows Mobile. The interoperability among the three, however, isn't as streamlined and therefore not as consumer friendly as the Apple solutions, which are cleanly tied together through iTunes. And according to news reports, Xbox Live has something like 6 million users versus more than 100 million iTunes users, giving Apple a significant advantage in the number of eyeballs potentially leveragable across all three screens.

The real differentiator here could be the ease and usability of Apple's interface across all screens. Do you think the iPhone will allow Apple to capture all three screens? Or will Apple's closed front to developers doom this effort?