The idea that service jobs are completely separate from manufacturing jobs is just misguided. Many business and professional services are related to manufacturing jobs-- that is who is being serviced in many cases. If you lose big manufacturing firms or have to scale back, you also cut back on janitors, accountants, design services, and all the other folks who make firms work.
In a large sense, the decline in manufacturing jobs as a percentage of the workforce is very overstated in the last few decades. Many more services that used to be done in-house were counted as manufacturing jobs and are now counted as service jobs. But just because they are now counted as service jobs doesn't mean that they won't decline when manufacturing takes a hit. Don't mistake the outsourcing of manufacturing services for the lack of importance of manufacturing in sustaining those outsourced jobs.
>From the Philly Fed Reserve Board's Q$ BUSINESS REVIEW:
"contributing to the decline of measured employment in the manufacturing
sector has been the increased outsourcing of manufacturing firms' ancillary
nonproduction functions. Workers in areas such as accounting, marketing, and
shipping would have been counted in manufacturing employment if they were
employees of manufacturing firms. If they are employed by accounting firms,
advertising agencies, and transportation companies - as many now are - they
are counted in service-producing employment. Similarly, a large increase in
the use of temporary workers in the manufacturing sector increased the
number of workers counted in the services industry (where temporary
employment is counted) and decreased the number counted in manufacturing."
Nathan Newman