There is a simple and highly cost-effective way of resolving the debate between those in favour of promoting the use of Gaelic and those opposed to spending taxpayers’ money on the matter.
I once heard a talk by a highly articulate and witty member of the Welsh Language Society. He blamed the British government for the poor state of the Welsh language. If the British government really wanted to encourage people to learn and use Welsh, he argued, they should have banned it.
Given human nature, one can see his point. Ban Gaelic and not only will the taxpayer be better off, but learning and using it would become very popular.