At 5+ years she seems to be suggesting she’d be willing to step down if the Dems beat Trump in 2020, before the outcome of the 2024 election is known—to avoid a Merrick Garland situation before the GOP might regain the presidency.
True, and even then, RBG might try to hold on and dicker with a new Dem administration as to whom they appoint to replace her. Of course, at RBG’s age, death or disabling illness may decide the issue at any time.