Is ethnic globalisation inevitable?

Today John Cleese says London no longer feels like an English city, and I'm sure many people of his generation agree. We're increasingly seeing more and more people in the world try to fight growing tide of globalisation at the ballot box, movements like Brexit and Trump were largely fueled as a result of a backlash to ongoing globalisation.

Have a look at the percentage of white British population in the UK for example since World War II:

1951 - 99.8%
1961 - 99.2%
1971 - 97.8%
1981 - 96.5%
1991 - 94.5%
2001 - 92.1%
2011 - 87.0%
2021 - (probably somewhere in the 80%-85% region)

This is only going in one direction. Now I'm personally a fan of globalisation and embrace this change, but a lot of people as we know don't and movements like Trump and Brexit are largely motivated (although not every Brexit/Trump voter I stress voted because of this) to try and stop what they see as the erosion of the nation state and ongoing cultural and ethnic globalisation.

I personally think these people (e.g. Gemma O'Doherty) are on losing cause, ethnic globalisation to me is simply inevitable. The vast majority of human population isn't white, infact only 10-15% is, and obviously a lot of non whites are going to continue to flock to wealthier countries (which largely happen to be white) and thus demographic changes ensure.

Is ethnic globalisation of humanity inevitable?