text: In this, I assume "our nation" is the Philippines?\n\nThe thing to remember is that such a drastic change in the way you are governed will have long-term effects.  The strongest anti-ChaCha argument I've seen is that local members of the House are often chosen because they have the backing of local oligarchs and prominent families.  With a unicameral legislature, and no nationally-elected President, a coalition of faction can rule the nation until the next election.