If you merge England and Scotland they would have a better chance of winning things. If Switzerland merged with Austria it would make them strong, if Brazil and Argentina merged their national teams it would make them virtually unstoppable yet I don't hear of anyone in these countries calling for it to happen. People want their national identity and a national team should be what it says on the tin, the national team of that country. Once you start merging national teams it would turn into a farce.