According to the US Department of Labor Occupational Outlook Handbook: http://www.bls.gov/ooh/Education-Training-and-Library/Librarians.htm#tab-6
Employment of librarians is expected to grow by 7 percent from 2010 to 2020, slower than the average for all occupations.
There will continue to be a need for librarians to manage libraries and staff and help patrons find information. As electronic resources become more common, patrons and support staff will be more comfortable using them, so fewer librarians will be needed for assistance. However, the increased availability of electronic information is also expected to increase the demand for librarians in research and special libraries, where they will be needed to help sort through the large amount of available information.
Budget limitations, especially in local government and educational services, may slow demand for librarians. Some libraries may close, reduce the size of their staff, or focus on hiring library technicians and assistants, who can fulfill some librarian duties at a lower cost.
Jobseekers may face strong competition for jobs, especially early in the decade, as many people with master’s degrees in library science compete for a limited number of available positions. Later in the decade, prospects should be better as older library workers retire and population growth generates openings.
Even though people with a master’s in library science may have trouble finding a job as a librarian, their research and analytical skills are valuable for jobs in a variety of other fields, such as market researchers or computer and information systems managers.