My family have lived and worked in Mid Wales for 43 years, neither of my parents have ever need a word of Welsh, my DSIS needs to be able to copy type Welsh place names-that's it!
I know several people who work in Wales, but commute over the border because they decline to waste their DCs time learning Welsh.
As Gaelicsheep says it makes Wales look inward looking and unwelcoming.
Yes incomers should embrace the culture of the country they are joining, but make that something they want, not have to do.
However, much a few zealots may wish differently, an immigrant to England needs to, eventually, learn English and immigrant to Wales need never learn Welsh.
Also Wales is not an island. It is far easier for my parents to go shopping in Hereford, than in Cardiff. A train Shrewsbury is quicker than Swansea.
Wales is a land of mountains and consequently it is a divided land, the Welsh language, accent and traditions of the North are not those of the South. They are not the traditions of the English speaking centre. Pembrokeshire and Monmouthshire are divided even within their own borders.
My GreatGrandfather came from Monmouth, DMum says he refused to be either English or Welsh as the border has been either side of his home area in different bits of history.
Devolution has replaced control from London, with control from Cardiff. Just because the politicians are closer doesn't mean their ideas are any more relevant.