I tuned out of WFB after 6th because the prospect of buying, modeling, and painting a new army was too much of a time burden. That doesn't even include carting around hundreds of models, setting up, and playing a game!
I saw the Age of Sigmar models and thought, "That's like four, maybe even five, awesome Blood Bowl teams in that box!"
I read the four-pages of rules and thought, "That actually sounds like a fun, and almost-as-importantly short, game to play."
I read the free Warscroll updates and thought, "Wow, now this sounds really fun. And they even brought back some classic units that they didn't have to, for even more fun."
Now I'm excited to buy the box set. At least I'll get some BB teams out of it, and at most I'll have a whole new fun game to use my WFB army that hasn't seen a table in ten years.
I'm only one gamer, but I'd say GW: Mission Accomplished.