I suppose thy could buy into an exclusive deal with a minority market share platform such as BB10 or WinMo8 instead, because then the installed base wouldn't matter. That would only work if they could: (a) offer a competitive advantage over ARM. (b) make it financially appealing to the platform vendor. (c) Pick a platform that has a hope in hell of getting market traction. Their best bet there would be MS/Nokia, but it would be a case of seeing if tying three sinking ships together works better than two.