I went to college for 4 years...majored in Computer Science with Business Applications. I had lots of computer books, science, and math. Yes, each was well over 300 pages long. Yes, some were heavy...but NONE were some kind of 1200 page monster.Maybe you only had flimsy textbooks but when I was in college mine tended to be big and heavy, especially when I'd have to take four or five with me which was very common.
The size and weight issue is HUGE, Apple is absolutely right to make that one of the primary selling points.
In college, I would attend a few classes each day (usually 3-4) and most had at least 1 hour or more between classes...so I did not need to carry around all 3-4 books every day.
Yes, there were times I had to carry a few books (maybe I was going to the library to study between classes)...but again, backpacks (not just for books you know...billions of hikers use them) are designed to not only CARRY 40+ pounds of material, but to make that weight COMFORTABLE while walking.
I'm not a body builder.
Is size/weight a selling point? Yes. But it's a bit of a stretch. Weight/size is ALWAYS a selling point for any product sold in the world, though. I'm more interested in how/why this new model would be adopted.