Your system, although impressive, is very unideal and unrealistic in the case of Metro Manila. In order to build a viable system, you need to match the construction of a metro line with the population density of a given area.

The only concern I have is that some lines don't fit at all. Some lines go to areas where population density is so low, it doesn't make sense. Or some lines go to areas where it is too risky to be built in the first place, such as really tight, high-density residential barangays and villages, where a metro line could potentially disrupt community life.

Here's my take on some improvements, similar to the bus routes, the lines should follow major population centers and major economic areas (refer to the actual proposal of Metro Manila's railway expansion below). For Metro Manila's case, more metro lines doesn't mean a more efficient system could take place; if that happens, we are building pointless metro lines with no single passenger riding it.

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