I love this change as the lump sum trading was too easy to exploit before. Funding your early expansion through resource sales has been a required strategy on deity until now. Also it was easy to tell if someone was going to DoW you early and then sell them whatever resources and gpt you had to get all their gold to then buy units/walls.
This way DoF really means something and is worth caring about. I think the OP is being too pessimistic because my impression from what I've seen of BNW (don't have it yet) is that many of the AI will offer DoF early on; so you can still get lump sum trades - they just require you to be nice and care about the diplomacy.
I have to agree. Lump sum gold trading in G&K was hideously boring, predictable, and lame. Moreover, Deity games were often easier (in my opinion) than emperor/immortal games due to the fact that AI's in Deity simply had more gold laying around--gold which you could easily take from them with a couple clicks on the diplomacy screen.
BNW seems to have 'normalized' a lot of the lame mechanics found in previous incarnations of Civ 5, so that now things seems to evolve in natural ways. Conflicts are based on an actual build-up of pressure (religious, political, etc.), and not simply the result of some schizoid need to wipe out the nearest civ ... just because you (or the AI) can. (Of course, this does still happen--it's just not 'required' of every civ now.) The same goes for diplomatic dealings. There is a gradual build up of both power and pressure as each civ slowly develops their economy and moves toward a certain set of ideological tenets.
I, for one, am happy to see the early lump-sum gold trading lameness go away. There's nothing "hard" about fleecing the other civs of their artificially inflated/Deity gold, and then snowballing your own civ toward an easy win. It may look good for a "Let's Play" title, but that's about it. Now that you have to actually play a c.3500 B.C. civ the way that it would actually play out (i.e., with few starting resources, few friends, etc.), the early game is a lot more interesting. Before, you didn't have much of a choice--or a reason not to destroy your nearest neighbor. Now, with the new trade and diplomacy systems, you have to be more careful about going to war in your backyard.