Not worried in the least. They wouldn't have done this if it weren't going to be amazing. The actors for the most part have careers beyond AD. Everyone has moved on. It's not like they've been clinging to AD desperate to make more, clutching at an any chance to do more AD regardless of quality. It's just that a unique opportunity popped up via Netflix that's unlike anything we've seen before (and hopefully something we see more of). They're excited about doing this, I'm sure they've thought a lot about how to do it right, and it's only going to be one season. The creator of the show has said that he would only be willing to do more AD if it were a feature film or if it were in some other special format because it's run it's course on the typical televised format. So here's that chance. And with such a smart creative team, I don't think they'll go wrong. Plus, AD has always been a remarkably self-aware show. They know what they're doing.