That's an interesting way of putting it. Scaling will always be a problem with monolithic records like you say. I have worked on a couple of distributed ledgers with sharding and these governance models seem to be more promising. Often there is some sort of democratic voting system for stakeholders when it comes to making change to the code which can be reduced by certain cryptoecnomic rules (e.g. demurrage fees for hoarders if it uses a proof of stake consensus). You're right though, its the fact that software needs to be updated by humans so that it stays relevant and reflects stakeholder interest over time that demands decision making. And this decision making often tends to materialise in (some sort of) centralised form due to the need to regulate and promotes good decisions (i.e. by experts). The same happens through Wikipedia moderating.