Good post Simon!
I am sure that once my campaign settles down, food becomes more regular and the ever looming threat of starvation seems a distant memory, this will need to be addressed.
One idea they had was something I posted a while ago. A manor system, where select people are 'given' land and tasked to manage it. Keeping a certain percentage while giving the majority to the 'government'. More like feudalism really.
But at some point the system will need to mature to meet the ever improving soceity the PC's have created, if it goes according to plan. /wink