LLMs can’t become AGIs. They have no ability to actually reason. What they can do is use predigested reasoning to fake it. It’s particularly obvious with certain classes of proble., when they fall down. I think the fact it fakes so well tells us more about human intelligence than AI.
That being said, LLMs will likely be a critical part of a future AGI. Right now, they are a lobotomised speech centre. Different groups are already starting to tie them to other forms of AI. If we can crack building a reasoning engine, then a full AGI is possible. An LLM might even form its internal communication method, akin to our internal monologue.
We have so many accents, even within England, let alone the empire, that we had to invent a reference accent. Queens English is what the BBC used for a long time. It was intended that all ‘cultured’ workers should be able to converse in it. This meant the upper class could travel anywhere and not have to deal with local accents, when ordering the servants about.
It’s still quite useful, since it is intended to be easily comprehensible to all English speakers. Downside is that it makes you sound like a posh twat.