I think for the groups there should be a command for the members to claim a group res by the command /groupres /groupres claim and /groupres. i think this would be a good idea because it would be a good place to make protected buildings in the wilderness and to not always to be in the plot-like world.
Groups aren't permanent though. They're like the "squad" or "party" function in most MMOs, not "faction." If a member of a group logs out for more than five minutes, they are removed from that group. When only one person in a group is left online, the group is effectively disbanded. Also, claiming land in the wilderness is a wholly separate thing from claiming a residence in town. As boozle pointed out, the only plan for land-claiming in the wild is via dragon eggs, which is expected to roll out when the Dragon Tombs are finally released. TL;DR, interesting idea, flawed premise.