I'm not entirely sure that 3 ecosystems will work out to the benefit of users. With just two platforms, there's a decent chance that top-selling apps will event

I'm not entirely sure that 3 ecosystems will work out to the benefit of users. With just two platforms, there's a decent chance that top-selling apps will eventually be ported to both. But with 3 platforms, you'll see a lot more market fragmentation and picking of winners. Witness the Wii/XBox 360/PlayStation 3 mess. And because Windows 7 Mobile allegedly runs a dodgy version IE 7, we can't make portable applications using HTML 5, either. So we're really looking at something like 1985, when developers had to pick between DOS, the Apple IIe, the Mac, and the remnants of the 8-bit microcomputer market. In this market, the correct strategy was to support a single platform and hope that it won. Ironically, Microsoft ported Excel to a huge number of operating systems, and they were eaten alive by Lotus. They've never made the mistake of fragmenting their efforts again.