Economy of obsoletism

I often hear that most jobs will be replaced by robots or mechanical functions someday, and my first thought was that might be a lot more money and effort than continuing to employ people. It would be expensive to create, install, and maintain all that machinery. Mike said the initial cost would be high but that it wouldn't expensive in the long run. That might be true. In that case, the majority of human jobs would be based on building and installing the technology, until machines can do that too. Once that happens, I wonder if there would be a financial meltdown or if the need for humans to have jobs would be obsolete--in the same way we see outdated technology as obsolete? And if that's the case, would we reconfigure our entire foundation of economics? Would there even be a purpose for money anymore?

Awkward teleportation moments

Advantages of teleportation: No more vehicular accidents, carsickness, or any other drawbacks of taking a long trip. Also, no more gasoline.

Disadvantages: Can no longer use the "I was stuck in traffic" excuse. Also, might accidentally appear in somebody's bedroom, leading to a lot of "honey, it's not what it looks like!" moments. Could just as easily accidentally teleport to people's closets or bathrooms, which isn't much better.