I was one of those fence sitters who finally jumped in. I've never played any version of Warhammer but was a devoted reader of Old World fiction. I was tempted to jump-into WHFB but right as I was about to start, the End Times were announced and I was pretty unhappy about that. I thought the launch of AoS was pretty clumsily handled all around so I sat back and wait to see what happened.
The timing of the second edition/Soul Wars worked out perfectly for me. I'm about to paint my first minis ever tomorrow. While I miss the Old World, I'm pretty intrigued by what AoS has become.