Frankly I think the new system is WAY WAY easier for modders to manipulate than the old system which by itself makes it far superior to the old system. I could never get my head around the old supply and demand system but I can easily make events now that can affect the price of goods to simulate changes in supply and demand by setting conditions for it.
Oh yes. I'm sure we'll be seeing mods with lots of historical and dynamic events affecting global prices. I would also expect at least one major project to use the new mechanics to create a complex supply/demand system far superior to the current one. I'm very optimistic about this change.