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Well, yes. Nothing lasts forever. It's less vulnerable than the Blackberry OS because it's not single vendor, but eventually something else will replace it or it will change to the point where only the name remains the same. But there's nothing imminent (iOS is limited to one vendor, Samsung's Tizen is a joke, Microsoft are pulling out for now, and niche platforms like Sailfish are just that).
For me personally the biggest risk is Google deciding to integrate their services too deeply with the OS, or evolving towards a more closed architecture. Either of these would be moving away from the idea of Android, and either woulld be enough to lose me.