[Pseudoscience-is-malarkey (OP)]

Let's say our planet's atmosphere somehow increased its Xe percentage from 0.0000086% to .005%?

[paul cotter]

The principle change would be that certain hi-spec discharge lamps and strobe tubes would be cheaper to manufacture and the practice of zenon anaesthesia would become more practical.

[alancalverd]

And we'd have to rename the gas. χενον means "stranger" but it would now be relatively familiar.

[Bored chemist]

Xenon would become roughly as "cheap" as neon (0.0018% of the atmosphere) - which is actually quite expensive.
About ?4 per litre.
https://www.boconline.co.uk/shop/ProductDisplay?storeId=715839134&catalogId=&productId=3074457345617269181&langId=101

I'm not sure anyone would really notice.

This might get cheaper.
https://en.wikipedia.org/wiki/Xenon_gas_MRI

Any thoughts Alan? More your field than mine.

[alancalverd]

I've never used it, but if the cost of gas is significant you can recycle a lot of exhalate!