I like a lot these ideas but like you suggest, it should be left up to debate amongst a community of people to represent the time, age and level of technology and capabilities of the times they are debated in.
One core thing I often suggest when I debate these things is the idea of wealth and wealth distribution ... it is a hotly debated subject whenever I suggest it because it is always clouded by the prospect or suggestion of communism or socialism and by extension totalitarianism and authoritarianism.
Of everything that could or couldn't be done about government or society, I think instituted wealth equality would make the greatest difference to human development. And it's a simple idea but an idea so controversial that most people disagree with it, question it or just don't even want to think about it.
The idea that an UPPER WEALTH LIMIT should be instituted and permanently set into society. And the limit would still be a high ceiling ... for instance, set it at $100 million ... how could it be unreasonable to think that anyone could live without wealth beyond that limit? In one lifetime? And the governing system would essentially remain the same, no authoritarian system, no big changes to rights of people, no big changes to how society functions or operates, just that one change - to enact a system where wealth of any one person is capped to an upper limit.
Because many of the problems of developing, redeveloping, reshaping, reconstructing, renewing or upgrading government systems or laws ... are all affected and influenced by those with wealth ... and the more wealth any individual or individuals have, the more they are likely to change or affect changes for better or for worse. And conversely, once wealth is better distributed to more people, the more likely it is to develop better, more representative laws and regulations because everyone (or more people) would be able to better represent themselves and influence control.
If we removed the insatiable greed of individual people from the system, then it would more likely be able to better represent everyone as a whole ... rather than always lopsidely represent only those few people with money and power.
Unless the issue of wealth, especially ultra wealth, is addressed ... the problems of developing any kind of new or old government system will always be crippled by those who want to hold onto or protect their wealth and power.