I suppose it's the result of that old Thatherite canard, market-driven demand. The customers (sorry, students ... ), apparently, don't want it, so the universities stop stocking (sorry, offering ... ) it.

On a slightly related note, SOAS advertises all sorts of weird and wonderful languages through its Language Centre programme (essentially evening classes) but actually only holds classes for a handful.

The current government has made all sorts of promises regarding the expansion of language-training, but has yet to deliver on any of them.