I know this question is not for me but I would like to clear things to you. First things first, the quota is for African black players only so the likes of Amla, Parnell, Duminy, Tahir etc. don't count. As far as the the adverse affect on the team is concerned I don't think it has played a huge part thus far but it is likely to in the future. The quota system itself is fine because it encourages the clubs to play more black players (2 per team I guess) on a consistent basis which will not only give black players a platform to raise their level of cricket but also the teams will be benefited with the monetary incentives for playing 2 or more black players in the team. That said, doing the same for the national team would not be a great idea until the black players, with the help of new quota system, become competent enough to break into the team purely on merit. I would, any day, pick Imran Tahir (despite his record in test is not much encouraging) and Quinton de Kock over the likes of Aaron Phangiso and Thami Tsolekile (purely because de Kock is a better batting wicketkeeper). Then there are the likes of Albie Morkel, de Lange and Juan Theron missing out the opportunities while a guy like Rory Kleinveldt (not black of course). The point is, the quota system is good to improve the level of cricket amongst black players in domestic circuit but if it should not hamper or curtail the national team's causes. Your very best 15 should make it to the squad no matter who they are, how they are and where they hail from.