> Makes sense that these small Alpine valley cultures want to speak the language their ancestors have evolved over the millennia, not some newfangled mashup.

That sounds reasonable, except for the fact that many, if not most, of the modern European national languages are in fact, newfangled mashups. National language standards are by and large the invention of the past few hundred years, where they either took a single regional language and called it the language language (such as French) or they kind of "mashed up", artificial standard (such as German). And yet somehow, these languages eventually took hold.

If Romansch doesn't die out in the next century, it's highly likely that a single standard will emerge.