I don't actually think Zeke is preparing for a future in which he'll have less than his parents. He seems to think the opposite--that if we simply tweak how we've been doing things, such as invest money differently, then having more is attainable and to be expected. The incompatibility of worldviews between Zeke and Tig is one reason they cannot abide being in the same room for more than a few minutes. Like RebeccaF said, he's still "part of the old world order that's dying," largely by abdicating responsibility and burying heads in the sand.
Tig's character, however, is definitely preparing for and expecting to have fewer material things than in previous generations. She's looking at the world from a more global perspective, with eyes that can see what shifts will be necessary to survive climate change and the resulting collapse of existing social, political, and economic systems. Unfortunately, she's so obnoxious about it, it's hard to like her, which means she--and the other millennials she represents--will have to work even harder to persuade people to their worldview and to take appropriate action.
We *need* to cultivate the adaptability, practicality, and frugality of Tig's slice of the millennial generation if we are to survive the coming changes. It's something Willa and Iano's generation seem largely unprepared to cope with--the idea that doing what worked before won't keep you safe any more. But it does seem like every generation must have had similar struggles in different ways, though, right? I mean that's the point of the parallel narrative here, and then there is the generation that learned to be creative and frugal by surviving the Great Depression. Not to mention our ancestors who survived the end of the last ice age, or the Industrial Revolution, etc.