We do not know that.
Clearly we do not. 
What is not sustainable, is the money put into these projects. Capital is scarce. That is limited.
A.I. could be unlimited. 
Look at what Gates allegedly said in the past, that 640K is enough memory. This probably not true, because instinctively we know that when the system expands, going to need more.
The computer from being a mainframe, goes to the desktop, to our hands. Probably going further too.
The internet, went from webpages and email, to platforms, that is still expanding.
A.I. is like the computer revolution and the internet revolution, that is the expectation.
That seems unlimited. We just do not know what is next.
Remember Jensen Huang? He wanted a graphics card, so we can play computer games! Would we have said that was unsustainable because how many people really want to play computer games? Maybe, maybe not. The truth is, we just did not know.
(I know I do not play computer games, I kicked my Pac-Man habit a long time ago.)
Therefore, that is the proposition in front of us. If A.I. is unlimited, then the demand for data centers will increase over time. 
We must remember how these LLM works, that a token is generated from a matrix calculation, that will generate another token, from another matrix calculation. In other words, if we ask DeepSeek a few questions, like 3 questions, the compute required grows exponentially with every question, that is my understanding.
So if A.I. is a grow industry, which it surely seems it is, as the Chinese putting A.I. into everything, that means the compute must grow exponentially to met demand.
This is a very solid business case for expanding data centers. 
And look who wants to do that, it is the insiders of the industry, in China and America. Generally it is the outsiders who are not buying the market.
That is the opposite of the 1990's tech boom bust. The outsiders were buying anything and everything internet related.
Kind of interesting.
