As a European, I have never heard of an Indonesian footballer who is strong enough to play in important competitions like the European ones, and there are many even in the lower leagues. Here, football is something else, it is always played everywhere and there are strong players in every corner. They shouldn't naturalise people at random, but rather take them from their country of origin, and it will be a better world.
You have a view that I must say is valid considering Indonesia population of nearly 286 million so finding high quality local players to strengthen the national team shouldn't be difficult however as a native, I must be honest the development of football infrastructure here is uneven and early childhood development is unstructured for one definite reason: the continued corruption of many politicians, I'm ashamed, but this is the reality, which is why they are do naturalization.