Glamorgan and Monmouthshire majority Welsh Speaking in 1914 - What happens next.

In OTL, Glamorgan in 1911 was 38.1% welsh speaking while Monmouthshire was 9.6%. Most historians agree that the anglicisation of the South Wales coal field and the valleys took place from the 1880s onwards with what John Davies describes as 'frenzied growth' which saw large numbers of English and Irish workers moving into South Wales. Up until the 1890s, the Rhondda, with the exception of LLwynypia, was majority welsh speaking and in the 1880s incoming English speaking workers had to learn welsh just to be able to communicate with their colleagues. Merthyr Tydfil was an example of an industrial town which saw language shift happen in this period; in 1891, 68% could speak Welsh, in 1911, 50%. Monmouthshire and Cardiff however were anglicised from the 1860s onwards, in the former the decline of the Ironworks and their replacement with coal saw the outmigration of welsh speakers and the immigration of English workers.

To prove that industrialisation doesn't have to result in anglicisation, the tin-plate town of LLanelli remains Welsh speaking until the mid twentieth century, as do the slate mining towns of North Wales until today even. In this alternate timeline, industrialisation happens in a way so that Glamorgan is still majority Welsh speaking (preferably over 70%)although Cardiff doesn't have to be, while the interior of Monmouthshire also stays Welsh speaking, in 1914. Thus Welsh in 1911 has more like 2 million speakers, rather than the 900,000 in OTL and the only English speaking counties in Wales are Pembrokeshire (South) and Radnorshire.

How would this change the status of the Welsh Language in the following century? Given that Plaid Cymru was formed in OTL to protect the (now minority)welsh language, would it still get founded? Would Wales now be an independent country?
 
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