This answer will vary depending on your doctor, but here's what my doctor told me:
PR splits in thirds. For one third, they'll eventually go into remission and never have systems again. He noted that for women, this tends to happen around pregnancy/birth. For the second third, they'll get worse and eventually develop rheumatoid arthritis (RA). For the last third, they'll stay relatively constant. They'll go through ups and downs and maybe even brief remission periods, but they'll always have flares yet never have permanent joint damage.
Regardless of which category you ultimately fall into, doctors will prescribe medications and possibly diets or exercise plans depending on your inflammation levels and overall condition. You can see improvement in the amount, length, and severity of flares with medications. For some people, medications stop the flares entirely. For others, it's simply a reduction with assurances that medication stops progression of the disease.