To offer a less sarcastic remark, let me point out that you seem to be claiming both that there would be "no common culture" and that "America ... will be the same as ... Canada", i.e. there will be a common culture, but it will be shared by everyone.
You could certainly make a strong argument that this monoculture would prevent cultural innovation, but I don't actually think there would be a monoculture, just as there are multiple evolving cultures present within countries today, and in fact a given person can feel an affinity to multiple cultures simultaneously.
Quoth the Internationale: And end the vanity of nations. We've one but one Earth on which to live.
Put like that, doesn't sound bad.
> Sounds depressing. Personally, I'll settle for lower GDP.
Lower GDP reduces the amount of wealth that can go around. Sure, it won't matter for those who already have a high standard of living. But for others, it would mean a hollowing out the bottom of Maslow's hierarchy of needs to decorate the top.
The EU has freedom of movement and very vibrant local cultures. Arguably, the same is true of the U.S. Even many individual cities within countries maintain strong identities that set them apart from other places.
There are valid reasons to argue that totally open borders are unrealistic; but to think that they'll ever lead to a monoculture is quite baseless.
The USA had many rich local cultures, and to some extent still does - there's a lot of regional differences. But it also has ghettos and isolation, and an awful lot of senseless racial tension.
Is cultural melding inevitable? Maybe, maybe not. But you can't take a mere generation of EU freedom of movement as an indicator of end-state.
PS thanks for the copypasta
Look at how popular English is internationally. Or the role of American pop culture.
We’ll all wind up sparking English, eating from MacDonalds, and wearing Adidas.
"Civilization is a youth with a molotov cocktail in his hand. Culture is the Soviet tank or L.A. cop that guns him down." - Edward Abbey
Let us be downvoted together. Doomsayers often are hated.