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If you compare it that way
it sounds like WP7/8 will never get any where, but if you look back at when the iPhone came out, there was already many mobile platforms that had more (Windows Mobile, Palm Pilots, Blackberry, etc.). So why bother coming out with an iPhone? Because technology was now at price points that would allow more people into markets that were previously niches. This was true for the iPad as well. There were tablets of various kinds before the iPad, they were just too expensive for most people to buy. Now that touch based hardware is nearly everywhere, this market is open for even more products.