Remember that there really aren't any federal restrictions per se. In our system, those kinds of things are left up to state governments. Each state is going to be different in how quickly restrictions are lifted. I think you will see some states push to lift all restrictions and return to total normalcy by early Spring. I think you will see other states that try to hold on to some restrictions through the end of the year. A lot, of course, depends on how things ultimately play out with vaccine distribution as well as trends of cases, hospitalizations, and deaths. But, regardless, not every state is going to do it the same.
None-the-less, I think the prediction of many/most restrictions being lifted by sometime in Summer, assuming vaccine distribution stays on the path it seems to be, is reasonable.