Having seen the (terrible) level of knowledge that developers who think that they are experts in SQL Server have as well, I am little surprised at Jeff's frustration. It appears that the level to satisfy "just enough know-how" is far lower than it should be across the board. This must not be deemed acceptable so that we can raise the bar(s).

Some people will work hard across a broad range of technologies but, due to the requirement for a width of knowledge, will stop targeting learning in one area once they perceive that they have gained an accepted level of expertise.

The more we push back, the better this situation will become.