There will not be a single model for what it means to "go to work." We are not going back to what was, but rather going forward in multiple directions simultaneously. This will be a dynamic era in the culture of work. While businesses are willing to experiment, I don't see the same happening immediately in the government world.
Likely business will have to lead the way and government will drag its feet with an HR rope tied around the leaders' necks. Labor agreements will be another dynamic to consider as we move forward. "Working conditions" are a negotiable aspect of most labor contracts.
It will be an interesting time for thinking about what it means to "go to work."