So let's pretend the cricketing world was to reduce the top 8 teams to 4. This involved the merger of two national teams into one and taking the best players from each of the two nations to form one team, without politics and regional bias.
Now which team would you choose your team to merge with. Now this could be purely strategic in that you can combine the different strengths of each of the two teams to eliminate any weaknesses in your current team.
For example, I personally would choose South Africa to merge with my team (India) as they seem to have a plethora of bowling talent, which combined with India's batting will form the best combination. South Africa will continue to provide us the fast bowlers, while India takes care of the batting and spin bowling departments.
Of course, South African batting is also very strong, so it will provide some good assistance on that front as well.