Looks like that changed a bit since I last read it (when I had access). When I started writting a Freespace RPG I even tried to incorporate the most of it.
Some points I would like add:
a) A likely economic exploitation
-Even though outright military conquest is a hard proposal the very harshness of space and the subsequent dependence on the homeworld for essential resources (water, air, metals, produced goods, fissionables, but most importantly food!) would render the colonies defenseless against economic blackmail.
-Producing food is a lot harder than one would think. Synthetic food can alleviate the problem, but isn't likely to solve it. You need vitamins, minerals and a number of essential amino acids - and a gazillion of trace elements - in your long term diet.
-The hardest to produce part for growing food is soil. (It's an entire ecosystem of its own with a myriad of living organism interacting. If it breaks down you're left with humus - great to enrich living soil, but worthless on its own).
-By 2200 most of these obstacles would be a thing of the past. In the meanwhile though, Earth could mercilessly tax the colonies for the needed amenities.
b) The likely exploiters
-Even now Earth is slipping more and more into the power of huge corporations that exists above and beyond nations. Their economic power is second to none, and their subsequent political clout make them hard to ignore. Unlike governments they aren't liable to the general public and their conduct has been often downright sociopathic (def.: a sociopath is one without compassion, fear and an abundance of selfishness).
-They're the only likely source to field the capita solar exploration and exploitation would require
-There conduct has been already questionable here on Earth, imagine what they could and are willing to do if there is no government oversight, and they can literally make everyone pay for every breath of air.
c) New Societies
-The workforce of the colonies would be likely recruited from poor nations with high enough education or the impoverished of developed nations. Why? Because once the basic infrastructure is in place, you no longer need extraordinary and expensive people just to dig, mine, and transport. The average blue collar worker will do and is a lot cheaper.
-Since the Moon is the closest and oldest colony the Lunarian population would be the most developed and therefore contain the greatest amount of intelligentsia and high society compared to other colonies.
-The Jovian colonies would likely have a still high concentration of space explorers (scientists, astronauts) as they're still more or less living in-space at the edge of the explored/colonized space.
-Mars is the likeliest contain the least educated and most impoverished percentage of colonists.
d) New Culture
-The environment one grows up in, has an immense effect on the psyche. One can't disdain the new emerging traits in these new "phenotypes" of homo sapient sapient with a shrug.
-Spacenoids (people who grew up in micro gravity - Jovian are the prime suspects, but the Lunarians also likely fall into this category) could live all their life in artificial ships and habitats. As a result likely have an extremely keen sense of 3D space, an immense sense of economic interdependence. Their culture would run very-very counter to Earth's current all powerful consumerism: to them, consuming is a necessary evil; and willful and wasteful consumption is a sin. Without medication or genetic modification their bodies would be naturally frail.
-High-landers, or the Martians would have an even stranger set of standards. They are lithe and tall, they live in a semi-hostile environment, and while Lunarians could be natural agoraphobics; these people would likely be in love with space and the huge overwhelming landscace of their birth. The average Martian hill easily dwarfs our greatest mountains, and on the planet they can easily leap about like tall and graceful giants born to that world.