Now that is a serious set of points to make. I happen to support a traditional, rather than a progressive point of view, but then y'all shouldn't be surprised. I think your tone, Kurt, was more aggressive than you intended.
1. I agree there are too many people. The Biblical mandate to cover and master the Earth has been accomplished already, even if one accepts that particular mandate. It is a positive option to limit one's childbearing to one child, or to not have any natural children at all. I regard that as the woman's own choice. It is also a positive option to adopt a child, regardless of how many you already have, provided you don't go overboard with it (Nothing in excess).
I know people who are religious "full quiver" believers ... that it is important to have as many children as possible, because you want to build your own tribe of believers (even religious subsect), so that thru tribal growth your own culture/religion will become more dominant as an overall percentage. Their's is a modern version of a very ancient tribal mandate, which is the actual basis of the Biblical one (which is to maximize the number of young men for warfare). This is the view I believe of most Latin Americans, Chinese, Indians and Arabs ... who in some ways have never fully modernized like the West. The "full quiver" believers I know simply are a statistical outlier to most of the Western people I know ... best to simply not give them a tax deduction for extra children.
And fewer people means not just better for human habitation, though that is a valid humanist point of view, but also for the rest of the biosphere. We need to make not only a smaller quantitative footprint, but a smaller qualitative one ... both of which require the abandonment of consumer capitalism, even though that will lead to temporary unemployment. That would imply elite socialism as the correct course

Democratically the right thing is to limit one's own family, don't give tax subsidies to other people's excess children, and voluntarily stop being such a consumer, but be a saver ... before the demographics and economy forces it on one. Voluntary is better than forced. And the choice in favor of limits (Club of Rome) is best done thru education.
2. There is a lot of money to be made off of seniors. Both legitimately and predatorally, because in the current time they do have a lot of money and not much time left. One way is to engage in heroic, very expensive, and risky operations on seniors, that could be more legitimately done for younger people, if they had the money or insurance. AMA rules encourage this. If one can afford to buy health insurance on one's own, I see no reason why one shouldn't be able to. But perhaps it is not right to provide free health insurance to seniors ... so stop Medicare in the US, and transfer that expenditure to free health insurance for juniors ... something that Obama seems to be attempting to do, with false claims of Medicare savings being used to fund his plan. I believe that the savings won't be found (government often uses this will-o-the-wisp), it will simply be a mandated cut. In Canada, are you willing to cut off universal health care to people over 70? I don't see either as politically plausible in the US or Canada.
3. Most people in the non-West, have never had a good life, and never will. So I assume you are addressing only Western seniors. I have no good answer for assisted suicide ... other than the traditional religious one. There are many complications, including criminal exploitation, associated with assisted suicide. It is bad enough that some corporations are taking out secret life insurance policies on their own employees, with no future benefit for the employee's family, and then working their people to death ... getting the beneficiaries of wills involved in assisted suicide, has no legal upside. As far as knowing one's own limits regarding quality of life, it seems seniors are already deciding that for themselves. Or are you proposing involuntary euthanasia for those unable to make their own decisions? I would hope not.
4. I am glad that you see some suicide bombers as manipulated victims ... I think many are ... though I think some are simply overly ideological. Never the less, I have greater compassion for their victims.
Shalom