Today's specialized AIs have little chance of becoming self-improving, but as as specialized AIs adopt more advanced techniques (like the ones Nesov suggested), the line between specialized AIs and AGIs won't be so clear. After all, chess-playing and car-driving programs can always be implemented as AGIs with very specific and limited super-goals, so I expect that as AGI techniques advance, people working on specialized AIs will also adopt them, but perhaps without giving as much thought about the AI-foom problem.