I'd kind of like to see it as it currently is...anyone can build anything anywhere....With the caveat being that the only "safe" place is in tribal areas...if you strike out on your own...you become vulnerable to the whims of others who happen upon your spot...yes...even while you're logged off. If a tribe felt your area was an eye sore, or too close to their lands...they could raze it to the ground.
With this style of building...you may even see loners, sort of grouping/building together for a saftey in numbers type of thing, but without the non-PvP saftey status. Who knows, maybe a trbe would eventually come of it....then POW!!!! ...another group likely to stay with the game even longer.