How long to wait depends on what it is.
Me? I’ll keep to zoom, distanced outdoor masked gatherings, and family exercise until the vaccine is out or cases drop below one new daily case per 100K residents. Not so much fear as wanting to do my part. I don’t want to add to the virus by going out to Starbucks every day.
Country? Even with the current case loads, I think most businesses can open at lower capacity, provided we have good distance, masks, and ventilation.
Indoor dining, bars, and stadiums? These should have to wait for a vaccine or very low case numbers.
Schools? Open elementary in small stable groups. Good MS and HS students can handle zoom just fine. Add in some outdoor intramural sports and it sounds ok. I have no idea what to do with slacker MS and HS students. Probably need schools in small groups and masks for the wardens teachers.