I think the Devs see the Trade Deals as being continuous gold sink, which they could be, just not at the current price.
Lets do a little math. (lets assume that all cities have governors and all cities keep funding a deal)
27 shards x 9 cities x 2,000,000 gold a week x 52 weeks a year. 25,272,000,000 gold a year theoretically taken out of the UO economy.
Spelled out: 104,000,000 gold per city per IRL year x 9, that's 936,000,000 gold per shard every year. X 27 shards = 25,272,000,000 gold.
I'll bet someone is enamored with a theoretical 25+ BILLION a year gold sink. However, it's unsupportable in the long run (through legitimate means).
We know that the above number isn't what's really being removed from the economy of course, many towns forgo a Trade Deal, and the number of empty cities listed as 'PKC' has risen yet again. The cost of the trade deal, usually falling on the governors to fund, is the #2 problem issue when the system is discussed (#1 being lack of ease to communicate with city citizens).
While better communication could require potentially extensive server-side tinkering, rejiggering cost of the trade deals could be hot fixed within a day. If the system is truly "still in its infancy," then lets see it adapting to the realities of life instead of blindly stumbling in circles.