So $400B per year is currently spent on datacenter buildout?

To see if that is too much or not, we have to put that number in relation to the value those datacenters will create in the future.

If global GDP is $100T and labor is 50% of that, then the current TAM for intelligence is around $50T.

How much of that has to be automated per year to justify $400B of investment? For a 10% ROI it would be around 1%, right? But the datacenters will not be the only cost of generating artificial work. We also need energy, software and robots. So let's say 2%.

So it comes down to the question whether those datacenters built for $400B will automate 2% of global GDP in the foreseeable future.

And there is another option: That the TAM increases. That we use the new possibilities we have to build more products and services. And see global GDP grow. 2% AI driven global GDP growth would also justify the $400B datacenter buildout.

So let's think about a mix: 1% labor automation and 1% GDP growth per year via AI. That would be needed to justify continued spending of $400B per year for the AI buildout.