Armitage, I do not have a physical presence, only a website. But I wonder if my clients would need to care about an office? At least I have not found any clients that bothered. And if a client would expect me to have an office, I probably would start wondering if this client will be able to think in solutions. Because thinking in cliches often is a sign of a mind, that only sees problems.
If I need to meet a potential customer, I would meet them at there location. And if they do not have a location a hotel or restaurant would be as good as anything. As long as the place is quite and leaves room to have a friendly getting to know each other.
I am not yet a nomad or work wirelessly, because I do not see the advantage of starting to work at something right out of the box. Sometimes you need to take time to let the meeting sink in and create new insights.
So I think working without a physical location is not that big of a problem for knowledge workers. I can imagine it becomes a bit strange if you are building something with a physical presence. But I expect that even architects will be able to work anywhere they like in the future, except for the building that is going to be erected.
And clients that want me to have a physical presence can get one, but that will mean I need to ask a higher price, because it is extra costs, that do not add anything to the quality of my work.