Should architects become more specialized? In practical terms, this has already happened. Large firms will have various studios that can function as distinct offices. A sole practitioner will tend to find a niche--usually in house design.
What is the end point for all this? Specialized licensing requirements? The dangerous thing here is that no matter how specialized an architect becomes, he or she will always maintain the posture that design skills can be transferred to any type of project or client. This attitude makes lawyers happy.