Here's another kind of platform war.
There's a story going around the net that Iran is starting an oil bourse, where people can trade oil in Euros instead of dollars.
Read here for the geopolitical effects, including some of the theories of how this influences the current US build up of rhetoric against Iran; and here for some fairly good criticism.
I'm not sure which of these positions is more plausible, but what I am convinced by is that the petrodollar ecosystem is as much a platform as the Windows or iPod ecosystems are. And that, there could be a platform war fought between it and a petroeuro platform, and if so, generic platform war strategies would apply.