Not going to get to the economic issues, but its going to be obviously bad.
The group of people that I really think are going to be hit hard are likely women. Other groups are also going to be hit bad (like men currently), but just musing specifically here.
Inb4 someone takes what I'm about to say as universal of women, but in general, I do think that women have maternal urges that will surface at some point by their 30s, and not feeding into that, not building a family, not having family life, or kids- I think that is going to take a major toll on the psyche of a lot of women.
You should be able to choose whether or not you have kids or get married, don't get me wrong;
But look at all the younger boomer or gen xers women who were ultra career oriented, didn't have children, and even with all the "success" still go through a major existential crisis and have major regrets over this.
I think that said dynamic is only going to be much, much worse for millennial women. You don't know what your future self is necessarily going to want in life, and so obviously people fuck up, but we're fucking up in such a spectacular way, and I'm just surprised that fewer people than I would have expected are catching onto this issue. Will the wish for children be significant later in life and will there probably be biological drives or wants that I'm missing out on and will only regret later? Very likely.
Now, lets make it worse (the slogan of our generation).
You also have the issue that as a culture, we're much more superficial. Women, as the dynamic goes, have social advantages when they are younger such as beauty, that fade away with age typically. And yeah, if someone wants to comment, "maybe society's standards are wrong", maybe they are, but they exist.
We have a generation of women increasingly living more and more frivolously, not settling down, full of e-thots or clubbers. I think that a lot of women in my age group are realizing that the clock is ticking and genuinely trying to settle down in some desperate attempt to have a good life in their 30s or 40s, but I just think that so much damage has been done already and that most of these women have basically fucked themselves. The decent guys have already found their S/O, and otherwise older bachelors just arent interested in older women. Looks will fade, the likes on social media from random selfies will become less and less common, and I think that theres going to be major issues for many millennial woman as they age, because they got sold a false bill of goods.
Thats the caveat, being sold a false bill of goods is pretty typical of this generation, such as "go into debt for college or university, it'll open to door everywhere". The notion that women can be free, hypersexual, and worrying about starting a family doesn't have to be a primary concern for women is another such false bill of goods, that will come calling later on.