We have several customers that simply need to host read only data for their services but they feel the price point is too high for ArcGIS Server. We suggested ArcGIS Online, but they must serve traditional map services for several reasons, one of them the SOAP capacity.
It would be great if you could deploy ArcGIS Server for only read-only map services. The absolute bare minimum. Take away all of the cool functionality and just have a simple map service publisher.
Limit it to only FGDB as well so it only supported non editing environments.