Ink selling is very profitable especially if there is no competition and a high demand. If the new Canon printers have the reqired gamut , dynamic range, archival properties and importantly linearity, then prices could well fall. Ink usage then becomes less an issue. Denser inks, ie more pigment per drop , would reduce ink use but raise costs and most probably frequency of nozzle blocks. They may also result in wider gamut , but this is of practical use in only a minority of situations .I don't get gamut warnings very often with the K3 inkset. Use of the extra colours in the Canon set should widen gamut anyway and I suspect Epson's next series will be 12 colour too.
Solving the ink loss problem in changing matte> gloss and back will be a big one. So is DMax on matte papers.
In the end , providing quality is there, then cost per print is important, but ink is only part of production costs.
I can pay over $25 for a single sheet of paper. Floor space , maintenence ,energy, taxes , living and more must be factored in to obtain the actual cost of a print. How long does it take to make a fine print?
How much time did it take to gain the skills necessary for fine printmaking? What is all that worth?
Ink may become cheaper but how significant is that really?