Smart toilets could test for diseases / monitor health
In-home toilets with waste collection could be available in areas without sewer systems
Sinks could be above toilets
Public toilets could be self-cleaning
Urinals could be splash-free
Porta-potties could make waste collection / conversion easy, provide jobs, and include handwashing stations
Human waste could be turned into energy, insect feed, and/or fertilizer
Greywater recycling could be used
Porta-potty public restrooms could be nice and found through an app
Toilets could be cleaned with electrolyzed water
Governments could invest in large scale toilet construction, maintenance, waste disposal, user feedback/design, sewer systems, and behavioral change/public campaigns
Single use, compostable toilets could be available in developing countries and humanitarian crises
Composting toilets could be available in areas lacking sanitation
Toilets could be high-tech (white noise, music, heated seats, bidets)
Toilets could be squatted upon
Toilets could have bidets
Pit latrines could be closed off from open air
Local governments could be encouraged and enabled to construct sewage systems
Toilets could have motion-activated night lights
Toilets could be dual-flush