Thank you.
Believe me, I have tried convincing JWs on the streets and had a hard time. Some are just really hard-headed even if you present them with their own publications and verses in the bible as evidence to the Watchtower's wrong teachings and corruption, and some just bow their heads down pretending to not listen and make a worried expression whenever I said something critical to the organization's teachings (I mostly get this from JWs that have a limited understanding of their teachings and those that I assume are having doubts). Probably it's their fear of the organization that makes them refuse to listen or leave like most stories I find in the internet. I never really have successfully convinced a JW to leave, or not that I know of since I don't really know any of the JWs I mostly spoke.
And your observation of JW Filipinos is correct. But that doesn't just apply to JW Filipinos but Filipinos in general. Well, okay, most of the Filipinos. It's just part of our culture to have close family ties so, yes, there are just a small number that leave.
I also noticed JW Filipinos never really do shunning properly compared to other countries. Like my friend who has a disfellowshipped older sister for committing premarital sex. He and his brother converse with her all the time but when an elder comes to their house to visit, not a slight word can be heard between them. But I'm not really sure about this since I have only personally known 3 JW families.