You are right, it raises the entry-level price and repositions the Air line. What I mean by raising price is that, in fact, it raises the price for someone who is tempted in the low-entry Air and is not currently that interested in the middle model (specially that now the base model has 16 GB RAM). The new MacBook will probably have nice features, but probably be under specced compared to the current base Air (probably like 8-12GB RAM and 128GB SSD) so it will now tempt the same customer to fork just a little more money for the middle Air model. So the current base Air customer who would have been well served by the base Air will be pushed to the middle model. Sure, some customers will just buy the new model too. But the Air will become a higher end machine than it actually is. The new entre model will surely have better margins than the current base Air, and let's not forget pricing will go up in a year or two helping on that front.