根据下面资料，回答题
Traditionally, universities have carried out two main activities: research and teaching. Many experts would argue that both these activities play a critical role in serving the community. The fun-damental question, however, is: how does the community want or need to be served?
In recent years universities have been coming under increasing pressure from both the govern-ments and the public to ensure that they do not remain "ivory towers" ( 象牙塔 ) of study separated from the realities of everyday life. University teachers have been encouraged, and in some cases constrained (强逼), to provide more courses which produce graduates with the technical skills re-quired for the commercial use. If Aristotle wanted to work in a university in the UK today, he would have a good chance of teaching computer science but would not be so readily employable as a philosopher.
A post-industrial society requires large numbers of computer programmers, engineers, manag-ers and technicians to maintain and develop its economic growth but "man", as the Bible says,"does not live by bread alone. " Apart from requiring medical and social services, which do not di-rectly contribute to economic growth, the society should also value and enjoy literature, music and the arts. In these cost-conscious times, it has even been pointed out in justification for the funding of the arts that they can be useful money earners. A successful musical play, for instance, can con-tribute as much to the Gross National Product through tourist dollars as any other things.
What is the main idea of the passage?