This was bound to happen. First of all, Sri Lanka doesn't have a large population. Their population is much lower than that of other South Asian nations such as India, Pakistan and Bangladesh. And secondly, they don't have a proper first class system. The first class system in Sri Lanka is comprised of clubs in Colombo playing against each other. There is no such system in any of the other cities such as Jaffna and Galle. When entire domestic system is concentrated in just one city, it blunts the emergence of talent from other regions.