The language is only part of the cultural heritage of an area
Other parts are the way people lived
The way they worked at what they ate and the build heritage.,
These Gaelic advocates are great at advocating for the language in the form of grants etc.
Then come and they eat the best of cheap food that Lidl and Aldi have to offer
And stay in houses which are a blight on the cultural landscape and more suited in suburbia
Than a Gaeltacht area on the west coast of Ireland.
This sounds awful snobbery, but the fact is that is a peasant culture.
The Irish speakers of the Middle Ages, even into the Seventeenth Century, encompassed all social classes. That is how healthy languages evolve. Spanish had the muledrivers and campesinos, but it also had Isabel and Velázquez. Prince and pauper spoke the Irish language too.
This culture, in the case of Irish, was focused on literature and genealogy, too much so for its own good. It did little in the visual arts.
Hence, when the Gaelic order was smashed in the seventeenth century, there was no upper class left speaking the language. And as something of an urban middle class emerged later, it was anglophone.
Same sort of thing happened with Quechua in South America.
What was left was a peasant culture, focused on the oral, with little access to technology. This culture is interesting, but minor. No one is ever going to adopt it.