Ignoring social distancing of itself will not of itself delay returning to some form of BAU. As reramping of restrictions will occur if the risk being mitigated by social distancing, ie Covid transmittal and community based infection, develops.
Social distancing is only a part of the risk mitigation, it is a means to the end, and should not be seen as the end in itself. Even with social distancing, any relaxation of isolation raises the potential risk of transmittal, that is why some jurisdictions have decided to go for full BAU and deal with the infections as & when they occur, as they do with most other common viruses. Even when a vaccine is availabl, it is unlikely to have 100% take up so there will still be transmittal and coved infection. Will lock down be reintroduced when those occur?