yeah, i'm sure a bunch of highly paid software engineers swooping in to deprived communities and inflating property prices would go down well with the locals...
In general, rural areas and small towns are not automatically deprived (though they can be), they are quite happy with attracting more well-paid jobs into the community to support the local economy, and they tend not to suffer from chronic shortages of accommodation like the big cities do.
I do sympathise with your cousins though. The few Irish-speaking regions left in the country are constantly facing similar challenges.
I'm British, I know Wales pretty well. Rural north Wales is pretty deprived