[a fool in paradise]

>>but scientists believe they could disappear in less than a 100 million years

more predictions they will never be held accountable for missing...

[Calvin Locke]

It's inevitable that the rings will disappear. If not from gravity, then probably when the Sun goes into the predicted Red Giant phase.

Right now, some of the rings are renewed by one or more moons that eject material into them, probably caused by Jupiter's tidal-effect gravity on said moon(s).