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Never going to happen, 25% of the population of Wales is English just to start with. That's English-born, there are historically ethnically English towns all over the place, even in the heartlands (particularly the coast in Gwynedd and Mon) and places like Monmouthshire which probably wouldn't/haven't shown any interest in being part of an independent Wales.
Just a hobby for some southerners, and the only real votes Y Plaid gets are places Welsh is spoken as a first language, in the North and West. My parents' MP is Plaid. But they have like, 10% of the vote, 10% of the MPs, no more than 20% of the Senedd. The split for independence - union is like 15-85. And there's a very low 'cap' to the extent to which they're electable. Bear in mind only 20% of the country speaks Welsh, 10% as a first language. Wales also doesn't have as recent a history of independence as Scotland does, and was never a united polity outside of English control.
Significant portions of Wales are directly dependent on the British government for their economic existence, particularly thinking of the parts of Mon and Powys that have large military presences. Either way Wales isn't really viable as an independent nation in terms of economy, hasn't been since the mines closed, and if Tata Steel closed its plant, there'd be like six jobs there. It would be tourism and forestry. That's it.
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