>>Intuitively, it seems to me that there must necessarily be some kind of upper limit

I mentioned this in other thread(https://news.ycombinator.com/item?id=48514481), we are at runaway intelligence already.

Mostly because we are looping AI to fix problems, and then the same data is used to improve AI. There is no upper limit to this.

Taken to its logical conclusion, this process needs a hardware scale that might even look laughably huge at this point. Its fairly obvious space is going to play a big role in the coming times.

I could be wrong, and I humbly accept it when Im proven wrong. But it does feel like a lot of people in top places know we are going to need all the energy and resources space has to offer to run this runaway intelligence.