I haven't been assuming that. I think this step is needed, but nobody has really defined precisely what success looks like. In 3 weeks I assume they re-assess and could very well leave restrictions in place.
I had assumed that as well. No reason things will look better by then, and the preventative measures taken in that time probably won't sufficient enough to otherwise resume normal life either.
Also, the cynic in me says that the government class wants to get people used to the idea of a shelter in place piecemeal, because it might not go over as well if they said 1 month straight out of the gate.