Are you of the belief that the US economy is slowly crumbling? The European economy? The global economy?
And how do you define "crumbling"? The loss of manufacturing jobs that used to be (arguably) the backbone of the US economy? Growth, that while positive, is slower than in prior years? Something else?
I would suggest that the economy (at least in the US) is not crumbling, but it is most certainly changing. There will be significant changes over the next 10-20 years. For example, many accounts suggest that self-driving cars will be a common "reality" within the next 15 years or so (basically by 2030, give or take). This will have an impact on insurance companies, truck drivers, delivery drivers, cab drivers, fewer deaths due to accidents, etc. There are other technologies that will require industries and individuals to adapt to stay competitive. But one thing I think history has shown is that, in general, we as a species are pretty good at adapting to new challenges.
Does that mean that it will be easy along the way? Certainly not. There are going to continue to be disrupters in pretty much every industry over the next several decades, but often, when industries have to change, it creates new (though different) jobs and opportunities that didn't exist before, even if it does cause other jobs and opportunities to disappear.
I think millennials will have the opportunity to retire, just like every generation before them. But it will be like every generation before them where some are better prepared than others. Additionally, with longevity continuing to increase over the coming decades though medical breakthroughs, etc., people may not wish to retire as early, or retire completely, as prior generations. The old cliche "50 is the new 40" (or insert whatever ages you want) may ring true in the future such that 20 or 30 years from now, people who are 70 are still working and planning to work another 5 or 10 years (just like many people who are 60 right now plan on doing - whether because they want to or have to).
In the past, you might work for the same company for 30+ years, retire, get your gold watch and your pension, and live out the rest of your days delivering meals on wheels or giving back to the community in some way. Even today, a lot of people don't want to fully retire (even if they can financially) because they love what they do, or it keeps them active, or a whole host of other reasons. I think you will continue to see that, especially as more and more jobs potentially become less labor intensive over the next several decades, because people will be able to do them longer without a risk to their health.
To paraphrase Mark Twain, the reports of the United States' demise have been greatly exaggerated. Do we have problems? Certainly. Do we need to make some potentially difficult changes (e.g. raising the full retirement age for Social Security, cutting government expenses coupled with possibly raising taxes, etc.)? I think so. Is the US on the verge of becoming Greece? I do not think so.
I am right on the older edge of the millennial generation (some definitions of the millennial generation include 1980 and some don't), and I fully believe that I will have the opportunity to retire some day. I don't plan on it for at least another 30-35 years because I love what I do. But I do think that "retirement" will likely look different than the retirement of a 60-70 year old today (for example, I think that by the time I reach 60 in another 25 years, they will have raised the full retirement age for Social Security and possibly changed the way benefits are calculated to help the program survive), but I fully expect that people will still be able to retire 30, 40, 50+ years from now.
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