One of the biggest fears and crucial ones, are that manufactering jobs are a little bit more stable in general. Sales jobs tend to come and go, and a person that works in sales, tends to change places of employment far more often then somone in manufacturing. The other parts of a service economy, or instability and lack of potential growth. If somone is a real estate salesperson working in an area, he can make a steady living, but if say there are no houses for sale at that moment, or there are to many competitors, he is doomed. He is put in a position where he would have to always expand, and or be forced out.
People in service jobs, since they have a tendancy to go from one place of work to another, lose out on many of the benefits that say working at a company for 20 years brings. A major concern though is becoming dependent on another country for it to supply you, your goods. The biggest knock however, is that, in reality, even service jobs, can be transported, even research and development can be outsourced. As the saying goes, good for the goose, good for the gander. If one can reduce costs by moving manufacturing, why not also the tech support (see India) or the engineering (also so India), one could even move the printing of the catelogs, or the design of the website overseas.
Already underway. Merrill Lynch has announced that it will send the lion's share of its financial analysis jobs overseas. Their comment was "If it can be done in front of a computer terminal, it can be done overseas."
Charming.