And I concur completely. Those contributions are, believe it or not, what I personally value most. My measure of success is whether or not my children will come visit me when I'm old - because they want to.
Still, recognizing that most of us can contribute to only a handful of people does not, for me, give rise to the notion that the entire future generation should keep all of us old farts up. The ruling classes have most of the private wealth (iirc, top 1% owns 12%+ of all privately held wealth - dramatically up from the 70's when they held 7%). That being the case, the great unwashed of us have less to spend on themselves and their elders. I see no revolution coming, which means that some largish segment of the unwashed has to lose. IMHO, it should be the outgoing generation, not the incoming one, that sacrifices most. Quick example: all the talk about a "prescription benefit for Medicare" is out of place, imo, when 1 in 4 kids live in poverty, many millions of them with no healthcare at all. Give them healthcare first, before throwing yet more money out of the pockets of the next generation and into the elderly's. Again, sacrificing the future for the sake of the past - I just don't "get it".