People using computers more in a greater range of disciplines at a deeper level doesn't seem like it would necessarily impact on CS at all - there might be more standardisation reducing the demand for new tools. There might be more focussed advances where one or two CS workers get their work adopted in to current tech. Both these things would lead to less employment of CS grads (in CS) wouldn't they?
It might also be that specialists without domain knowledge are not as desirable as those with domain knowledge who can go on to train in CS (or to add IT skills, which I just noticed are wrapped up with the stats you quote for CS).
To add an extra prong to the enquiry, does http://www.prospects.ac.uk/options_mathematics.htm showing only 55% of those studying mathematics having a job mean that we should not teach mathematics to the general school population?
14% unemployment among CS grads in the UK (double that of law). Yet you name it, the government wants more women, minorities, children, you name it to go into the field.
Something doesn't add up here.