It has to be Indonesia, no two ways about that. However, I believe that the set-up in Singapore has given it the potential to become a footballing power in Asia, if not the world.
Many people say that Singapore cannot become a footballing power because of the small size of the population. They couldn't be more wrong. It is more to do with the mindset of the people. Many Singaporeans' idealogy in life, well, is to study hard (and harder), pass your examinations, get a good job, buy a car, live in a condominium and start a family. Not many people would like to become a professional in sports, believing that the salary is too low, the career span too short, and the implications on health too risky. Just look at countries like Uruguay, Norway, Ireland, Croatia, UAE, Qatar etc. who have just about as big or smaller populations than Singapore, however, these are all respected footballing countries in the world. More people are willing to become a sports professional in these countries, the structure of development is good, and thus many good players can be produced (in no way am I suggesting the materialisation of people) There is no reason why Singapore cannot be as good as these countries.
With salaries becoming more attractive nowadays and better medical & health care provided, Singaporean's mindset has changed, bit by bit. You even hear about RI (Raffles Institution, Singapore's top secondary school?) wanting to play for the national team one day!
Singapore, I believe, has a good football youth set-up, with many primary schools and secondary schools becoming scouts for the FAS (Football Association of Singapore). As every Singaporean has to undergo 6 years of compulsory education, and no rural dwellings within the nation, any potential talent can easily be scouted for.
Currently, there are many imported players within the national team itself. Shameful? To a certain extent, but these players that are brought in are contributing a lot to the country. I personally dislike imports, but in the future, the future set of players can learn a lot from these players.
If we can maintain the discipline and organisation that we already have, and add more flair and techinique to our game, I believe that we can qualify for the World Cup finals one day. Goal 2018 here we come
, and World Cup Winners 3000 eventually