If you get the truce between quarians and the geth, Tali tells you the geth are helping quarians by modifying their suits and introducing infection-like conditions to help revitalize the quarian immune systems, so I imagine after 100 years and healthy born children who don't have their parents' same sterile lifestyles, I imagine the suits would be unnecessary, but probably retain a bit of a cultural attachment where they're still popular to a degree