It's all a question of balance. Taking things to extremes, we could make the EU a country, then perhaps amalgamate it with the US and others to make a global state. Alternatively, we could make each village a republic, like in the olden days, and have wars with the neighbouring village.
To my mind, the UK makes sense because, for starters, we (almost) all speak the same language. I know there are some people who speak Welsh, but everyone knows that they only speak Welsh when there are English people within earshot and they want to talk about them. Some Scots are trying to revive Gaelic too, but they're only doing that so that they can moan about the English too.
The EU could never function as a state due to the language barrier. The EU requires armies of translators, and everyone has to wear headsets. It's impossible to have a natural debate about anything. Written or translated words don't convey tone in the same way as talking directly to someone who understands your language. Some reading this might think that I think that Welsh people only speak Welsh to annoy the English, just because they can't tell that I'm not actually being serious.
I reckon though that if a region of the UK wants to go it alone then we shouldn't stand in their way. But this has already been resolved for Scotland - the Scottish people decided to stay. You can't have a rethink every time something changes. The same arguments apply as for the EU referendum - if you have another referendum then when do you stop? If Scotland voted leave then it all appeared to go badly for a few years then should they get another vote to rejoin the UK? Can they then vote to leave again? In-out-shake-it-all-about.
