Uh...no. Money is not the only reason that robots are used in manufacturing. It's a big reason, but not the only. Robots work much faster than human beings. Robots are safer, they don't get injured, need workmans-comp insurance, etc. They don't form labor unions, they don't sue their employers...and above all, they are consistent. CONSISTENT. They can be relied upon. Not only to be at work, but to perform the same operations exactly the same way every time...the basis of quality.
We are on the verge of a new industrial (like) revolution. The production derived by each human being on the planet is about to multiply greatly...even if most of those humans are not directly involved. Lawyers cost too much because they place artificial barriers to entry to their field. Law is become a club, that without membership, a citizen cannot defend themselves. That's about to change.
This revolution will place an enormous strain on our current capitalistic economic system. Production will become "free" (ish). Costs will plummet, prices will plummet, wages will plummet, profits will disappear. What's to motivate people when they don't need a shitload of money to live like a king? Agricultural technology has developed in the United States to a point where a single human, perhaps aided by maintenance contractors or the like, can farm 2500 acres of land. Tractors can drive themselves...and they do this not because farmers are lazy, but to increase their yields because the computer is more efficient. The technology does make *some* stuff cheaper, but it makes other things just flat out *better*. I've seen a dairy barn that's completely automated, from milking to shit shoveling.
And speaking of farmers...yes, there are large "collective" farms, owned and worked by corporations, but many farms are still owned by individual families and are effectively "small businesses". They are on the bleeding edge of technology because they have to be. This mass production technology is no longer the sole domain of the rich. You'd be quite surprised what you can manufacture out of your garage and sell on the internet. No, you're probably not going to be making bulldozers...but you might be able to knock out wiring harnesses, or machined parts or circuit boards or any number of different things.
Wal-mart does not sell everything...not even close. There's tons of room for specialty products, especially as the public becomes more accustomed to waiting a day or two for delivery. Services like Fedex/7-11's drop of boxes will help this increase even more....and you're still not getting anything from China in less than a week...not without paying through the nose. Chinese workers may be getting paid nothing, but the fuel to ship across the Pacific isn't getting any cheaper.
I doubt the economy will hit a wall with this, but there is going to be MAJOR change in the next two decades.