How could Common Brythonic/Brittonic survive?

Old Brythonic/Brittonic was an ancient Celtic language spoken by the britonic peoples of Britain. By the 6th century it had split into Welsh, Cumbric, Cornish, and Breton.

Sadly the language has been lost and what few sources of this mysterious language survive, are undecipherable and may not even be in Brythonic anyway!

https://en.wikipedia.org/wiki/Common_Brittonic

My question is: Is there any way that this language could have survived?
How would this affect Britain and the political systems that spring up here?

What about its descendant languages like Welsh? How could they be affected?

PS,I'm not a language expert and dont know much about them at all, I'm just fascinated by the Celtic world :D
 
It couldn't, not as such anyway : it was more of a grouping name for dialects we don't that much know about (altough I'd favor a mutual comprehension), and likely already differentiating themselves in post-Roman Britain, would it be along current political lines.

Now, depending the PoD (Ist century or Vth century for example), you'd have a lot of differences on the timeline : no-Roman conquest would likely preserve much of a linguistic continuum for example, but it would likely butterfly away the development of historical Brythonic languages as we know it (as well as a good part of regional history)

A PoD in the Vth, with a slower and more limited Barbarian advance (let's saywith an high-kingship like organisation among Romano-Brittons) would likely see these still appearing (would it be only trough Roman and Germanic superstrates being stronger in the South-East), albeit possibly closer to each other at least for a time.
 
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