This makes zero sense. GDP is not some fixed cap on economic activity. As earnings increase, so does GDP, and there is ample room for all other categories.

Also, taxes and labor are not parts of GDP. I don't think you're using any of these terms correctly, which explains the confusion.

>GDP growth is tied to working age populations growth and productivity growth which are very long term, predicable trends

No, those are factors related GDP growth, but are not sufficient or necessary. GDP can grow without them, it can shrink while those grow, etc.

Inflation alone growths nominal GDP, for example. Other factors include lower interest rates, capital growth, govt spending, devaluation against other currencies, consumer confidence, predictability, and many more.

>While I can be certain

It seems you're basing this certainty on misunderstanding of macroeconomics and ignoring important empirical evidence.