sabinati wrote:yes there are a lot of solutions, so lets just assume that they will happen instead of addressing the issues in the first place

If you're talking about them being robbed? Yes.. We all know that's a possibility. The lack of trade? We know that wouldn't happen, except to the ass-end of nowhere. And even then, solutions would be found. (Especially people who like to wander who are now carrying goods to trade).
The main problems I see with this system are social, not mechanical. The communities would have to learn to adapt to the removal of fast travel, and they would do so quickly.
There are so many elements missing in this game as far as trade is concerned. And one of the major ones is the difficulty of transport, there really isn't any with the prevalence of alts, unlimited fast travel to your hearth and/or village (which a couple of canny people using alts can arrange by changing out villages, etc), the dangers of transporting (Thieves and Brigands), and distance.
Combine climates with a lack of fast travel and suddenly it's important to import things from distant lands that you simply cannot grow or produce in your area. Export and trade becomes paramount to a major cities success, as well as protecting not just the city, but the trade routes that are travelled by either independent caravans, or city sponsored ones.
These are elements that are needed to:
* Break easy monopolization of world resources.
* Facilitate *interesting* trade and more varieties of game play.
* Maintain a breadth of world. (it's awfully small right now)
* Create localization of personality, laws, traditions, and economy.