I think it depends on the situation, there is no one-size-fits-all approach. I don't think I could go PIMO, it was difficult enough being active when I was still convinced that it was true and trying to find a way to get to more meetings and field service. Once I recognized that I did not believe, I pretty much stopped altogether. But I did not have the pressure that others do, in that I could walk away with only one real casualty (my mother), and she was dependent on me and not the other way around.
I think that most PIMO are in a tricky spot, especially if they are young. It's not their fault that their family and friends will turn against them and harm them mentally, emotionally, and possibly financially. Sometimes they have to play the hand that is dealt, and look for ways to build a support system so they aren't left adrift when they finally go POMO.