I can't speak for Theo's number (it does seem high) but in my own experience working on similar data models, the typical machine-generated data model size rough

I can't speak for Theo's number (it does seem high) but in my own experience working on similar data models, the typical machine-generated data model size roughly doubles every 6 months on average and has been growing at this rate for two decades. This implies that average data models today are a million times larger than data models a decade ago. Exabyte scale working data models have been something I've needed to consider in designs for at least a few years. We are surprisingly close to overflowing 64-bit integers in real systems.