Any insights as to why the Philippines won't adapt communism to fight poverty?
In my opinion as a social scientist of Filipino descent (my father is an immigrant from the Philippines and most of his relatives still live there), the Philippines does not try to adapt communism to fight poverty for two reasons.
First, it is not clear that communism can actually work to fight poverty. The evidence, for example, of North Korea is scarcely reassuring. China's economy has boomed as it has abandoned communism. This does not lead one to have a great deal of faith in communism as a solution for the Philippines.
Second, and more directly connected to the Philippines, is the fact that the government of the Philippines has always been staunchly anti-communist. This has been partly as a result of US influence. Even after the overthrow of the Marcos regime, this has not changed. The people who have come to power since then (like the current Pres. Aquino and his mother before him) have come from the same powerful families that were prominent in Filipino politics before and during Marcos's time. This means that the Philippines' political elite is strongly opposed to communism and so is, therefore, the government.
I suppose that you might also blame the Huk rebellion to some extent. The fact that the communists tried to take power by violence rather than through the political system might not have helped.