I'd just be happy with larger ink cartridges. It is sad how few milli-liters most cartridges have.
Also: Individual colors, and a head declogging routine that works on a single cartridge at a time instead of draining the perfectly good colors as well.
The final straw for me was when one color was blocked, so I did a couple of cleans to sort it out and that drained another color so I had to put in a new cartridge (luckily I had separate colors), run the cleaning again, by which time another color was flashing as empty and I had to change that as well. During this time my brand new black ink cartridge went down by about 25%. All in all that page cost me about $20 to print.
I went out next day and bought a color laser. I've had it about 10 years and only bought one new set of cartridges. It's always worked first time - switch on and print. I'd rather stab my own eyeballs with forks than own another inkjet.