First off, inkjet printers have way more issues than the ink being expensive.

Secondly, the average household isn't going to be printing enough to have to replace the drum every few years, or for toner dust to have an actual impact on indoor air quality.

My laser printer is nearly 20 years old, and I've only ever changed the drum because it came packaged with the toner cartridge, and I've only had to change that once.