It was time. We got our Uni APs when my sister and I were ready to ride more challenging fare and were starting to grow out of Disney; now, we've all grown a much bigger appreciation for Disney and were going more often with the passes we got from volunteering for runDisney, and whereas the big additions to Uni won't be for a few years, it feels like there's something new to do/see/eat at WDW every week.
As for me, personally? I realized that HHN was the most fun I had had at USF in years; I realized I'd be willing to sacrifice my own pass, considering HHN is a separate ticket.