Again, with "quality" versus "quantity" it sounds like you're saying that there could be a lower quantity of people (some people die) in order to increase the quality of life for others.
If you're asking for my personal evaluation, yes, I believe that at a certain point, it's clearly worth trading quality of life for quantity of life. This applies to my own life. For example, I would rather take a 50% chance at survival versus living the rest of my life in abject poverty and emotional turmoil.
I'm going to guess that you're no where near having to actually make that decision for your self, thus you're comfortable making that statement on behalf of others.
I only speak for myself and would feel uncomfortable enforcing my values on others. That's why my comment posed this more as an open question and discussion.