Thanks for the response, and for doing the math. After reading your response it I agree that it wouldn't have much more effect than an increase in elevation. I thought it might explain how the dinosaurs were able to grow so big without collapsing under their own weight(which probably can be explained too)
Interestingly, that article doesn't mention the theory that I think is most promising – that there was potentially a higher concentration of oxygen in the air when the dinosaurs were around, making it easier to get enough oxygen even if you were much larger in size.
In 'our' era, the megafauna of North America were pretty big as well (up until 13ka). Giant sloths, wolves, cats... and they survived an ice age. Not so well-known either.
