What do you think the effect of ultra-cheap computers will be on workplaces, will they replace all the rooms full of chair-warming people with rooms full of air warming machines by the mid 2020s?
What will Americans, Europeans and Australians do with all the spare time?
Not exactly what you're saying (I think), but, I'm pretty convinced that many industries are going to be drastically affected by jobs being obsoleted by technology.
At least in the US there are two items which I'm aware of which I see as likely:
1) Many truck driving jobs will disappear due to replacement with self-driving trucks. If you think about the long haul trucks which basically just travel from a set location to another set location via a set route on a continuous basis (mail, UPS, Fedex, other delivery services, etc.), there is very little reason why these can't be replaced in the very near future with human-less vehicles. Many other "paid driving" jobs will likely dissapear as well (taxi, etc). I see this as inevitable at this point as self-driving vehicle technology has already reached the point that in some driving conditions there are fewer accidents per mile with self-driving vehicles than with humans at the wheel. The National Highway Safety Administration in the US is pushing this particularly hard to reduce highway fatalities.
2) Longer-term, I suspect self-driving cars will enable such low cost ridesharing services that many people won't bother with owning a car anymore, which may hurt the auto industry. This is speculation though.
3) Various fast-food jobs will be subject to replacement by machine. McDonalds is adding ordering kiosks to 2500 stores initially, with 3000 more coming. They insist it isn't to replace jobs, but instead to free up the order-takers to do other jobs around the restaurants. But still, fewer cashiers as a result.
I could think of many other examples. But they're all very similar - technology has reached the point in many cases where they do at least as good of a job as humans do. As one more example, I've noticed that speech synthesis has gotten so good that many reputable news sites have switched to having all of their stories read by a computer. Most people wouldn't even notice the occasional odd inflection - at some point that will go away as well. At which point the need for voiceover people will be reduced.
The challenge in this is what to do with all of the dislodged workers. If you've been driving a truck for all of your adult life, and suddenly you're out of work because there are no more truck driving jobs, what are you going to do? The number of options available to you is limited, and for many retraining may not be an option.
I don't think it's all doom and gloom though - in sectors which humans work alongside (or on) technology, things are looking up. The challenge will be how to move the non-technical workforce into the technical jobs. I know in some parts of the US there is a problem where you have a large number of unemployed workers in exactly the same spot as you have companies which are trying desperately to find skilled workers.