What would this good government look like? Isaiah paints a picture in vv2-5 of chapter 32.
First - "Instead of being exploited by their rulers (e.g. 1:23; 29:21), the common people will be defended and cared for by them." - Webb, p136.
Second - A reversal of the blindness and deafness (e.g. 6:9-10) so that seeing, hearing, and understanding God's ways will become manifestly clear. Imagine leaders who clearly and exuberantly responded to God's Word!
Third - People will be judged righteously and lawfully (v5).