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The CPI does have formal methods for attempting to account for this:

https://www.bls.gov/cpi/quality-adjustment/questions-and-ans...

This can occasionally result in odd things, like when the introduction of unlimited cell phone data plans led core inflation to drop one month for first time in seven years:

https://www.wsj.com/articles/BL-REB-37505

I've seen at least some of this effect covered by the term "shrinkflation", basically the concept of companies reducing quantities rather than increasing prices.

Customers tend to be most sensitive to price changes, so we'll probably see more and more of these non-price inflation changes.

I assume that decreases in services will create decreases in goods. So GDP and CPI will reflect this.