Guy from the 80 said:
Well, good luck to them if they try... not everyone can afford a voice coach, and even if they can, I don't think many have the patience to voice train themselves.
Would they realy need a voice coach? How about just watching BBC? Or all channels broadcasting in "RP"?
Yes, yes they would. The way you can tell this is that not everyone who watches a whole lot of the BBC comes out speaking differently. Maybe adjusting your voice comes particularly easy to you, but changing to a different accent, getting it perfect and having that stick, is very difficult and requires a lot of work. Moreover, most people associate their own thoughts with their original accent, and if their accent changes, it sounds unnatural to them - regardless of whether or not they feel it's 'better'. Mimicry comes easily to me, when I'm exposed to a new accent or way of speaking, I'll often find myself adopting it for a week or so without realizing it - and for me to permanently change my base accent would be very tricky.
As much as I love Charles Dance's voice, it would be a tragedy to homogenize the English language like that. England is FASCINATING, you have such a diverse range of accents in such a small area, and then when they cross-pollenate, it goes even further. Charles Dance's accent is good, but it's good because it Stands Out, and it works well with his vocal capabilities and demeanour. Other people with different accents, English or otherwise, are not necessarily quantifiably worse, but qualitatively different - they make the strengths of their accent work for them.
I mean, to take Game of Thrones as an example - imagine a Game of Thrones where EVERYONE talked like Charles Dance. Firstly, it would be boring. Secondly, some people have accents which work better for them, or close enough as to make no difference. For example, Iain Glen (Jorah Mormont)? Would he be better off to talk in a different accent? He ROCKS. Would Mark Addy have been a better Robert Baratheon if he'd talked otherwise? I mean yes, he would have come off as more refined and deliberate, but not everyone IS more refined and deliberate, not everyone wants to seem that way, and not everyone wants to be that way.
Moreover, it's a part of culture, tradition, and personal choice - and you're not offering any good justifications to sweep all those away, just a vague articulation of some sort of eugenic approach to linguistics.