I like that there is the option of shorter adventure paths, but I hope we will still get 1-20 APs in the future. That's what I like to run and play in. Granted, I can always add a low and high one together, but I like the overarching for the entire 1-20 adventurer career. If some people think they are too long, why not build in a quick track where you level faster and have less encounters? And then have the slow track for those that like a slower build up to the end?