I think it will be with us forever, and, as Front says, there is no way of knowing that it just keeps waning. Other strains could be more virulent. BUT, as people get it, and many get vaccinated, that combines to immunize/insulate us against the stronger strains. They may be stronger, but we will have more immunity to fight them off.
What I think will also be with us forever are some of the social changes that have been made. Some good, some less so. I think there will be more inclination and less stigma to mask even if you just have a cold. This was previously common in Asia, but not in the west. There is a lot that is smart about that. There will be more acceptance of staying home and away from people when you are sick. And Zoom, like it or not, is here to stay. One upside is that people can work more from home, especially if they are a little sick, thereby protecting others. The downside is that I have to put on my lipstick and clean up my living room every time I have a bloody zoom call! Used to be just a conference call! (In seriousness, I generally like it...good way to put faces to names.)
But I absolutely think we have to start to go back to "normal." I was just listening to the head of pediatrics in a Philadelphia hospital, talking about the impact of all of this on kids: their education, their socialization, their trauma. They are our future, and they deserve a normal life. One thing that also may have changed forever, at least here in the US, is the "snow day." Now that there are online classes, they don't have to be cancelled for snow...just moved online. I heard a 9-year-old kid interviewed about this on the radio a few days back and he said, "I'm not going to tell the younger kids that there ever used to be a snow day, because I don't want them to know what they missed." That broke my heart! For those who don't live in a snow belt, a "snow day" is when you wait with baited breath, looking at the forecast and waiting for the list of school closures. When you hit the lottery, you get to spend the day sledding, making snow angels, maybe even skiing, and anyway just generally goofing off. Now, maybe no more snow days. It costs to pay teachers when they don't teach, but, aw....just give them one snow day, once in a while!