At my table, I found getting players on board to be easy enough. See Tristan's comment about the quick pitch, and they all seemed to be on board. The hard part was actually transitioning to the new dynamic. I was learning how to run a proactive campaign, and my players were learning at the same time how to write goals. We didn't do things perfectly from the get-go, and so we had to stop and talk about it throughout the campaign. My table struggled with making the goals specific, and I struggled to tie all their goals together. So the current campaign stalled a few times. But we still had fun along the way!