With the negotiation change, I don't think anyone is really qualified to comment on it for 6 weeks. People hate change and will rebel against change, simply because it's change. With something like negotiations where we've each fallen into a rhythm using our own particular method of negotiating, a change like this is even more difficult.
Brain synapses have become hard wired for the old method, both cognitively and kinesthetically. It will take about 6 weeks for the brain to rewire. Once it does, changing back would likely be as frustrating. Some people will have a more difficult time adapting, especially older players with less brain elasticity, and long time players with especially ingrained wiring. I also expect some older, long time players to never fully adapt. Old dog, new trick kinda thing.
My expectation is to be thoroughly annoyed at first, and in 4-6 weeks barely remember the system pre-change.