After umbrella shoes (which were supposed to let you float down from high windows in buildings), there really wasn't much point in going any further!
I tell you flatly that I've never met a SINGLE physicist who has maintained anything of the kind. I did once meet a chemist who said this, and I found it shocking. I have met several laypeople who have held this belief.
I believe that a complete and correct theory of particle physics is possible in my lifetime. That is not to say that a complete and correct theory of anything means that there is nothing left to learn about it, or nothing left to invent with it. In fact, having a good understanding of something is often a prerequisite to doing something really useful with it.
Not really. A more accurate statement would be: "Non-scientists believe that most scientists are of the opinion that they have discovered a great portion of all that there is to discover." The "public's" understanding of science is no better than that shown of FreeRepublic.