I don't think we are that far away, I really don't! The difference between a 6-3 team and a 3-6 team really isn't that much..............a couple of injuries, an interception, a bad ref call, a couple of good players in the draft (2016!!!) and things look different. Look at the 49rs in the last few years up and down like a yo-yo. It's not pre free agency anymore where the powerhouse teams were a step above the rest, the difference is wafer-thin between the teams so these very small adjustments/ luck can change our record in just 1 season.
I honestly don't think it's impossible that we do a 2015-2016 turnaround again next year. Next year's schedule has us against the AFC West and NFC South so outside the Chiefs, who's going to be a nightmare? A year older Brady and Brees? A rebuilding Falcons and Panthers? Broncos? I can't see WFT, Eagles or Giants being very good either. We may also have last place schedule so the Lions too.
2016s 13-3 repeating in 2021 may not be that far-fetched!