As for making the keyboard thicker, I doubt it. Once Apple makes a decision that dramatically alters their product in a way that users complain about, they generally don't backtrack. (floppy drive, CD drive, and Ethernet removal. Headphone jack removal. Losing Mac Pro traditional tower form factor. Flat design in iOS. etc etc etc)

But none of those changes cost them money. According to the article this is eating away their margin.