Changes have been announced to how Area 51 works in the future. Robert describes how the goal is to bring an existing and active community to Area 51 and start building their new Stack Exchange site, not to start the community building process at Area 51. I left a comment there, but I think the matter is worth more elaboration.
If I can't start building the community at Area 51, where and how could I create a community that I could bring there? There typically is no pre-existing community. And even if there was, it's hard to start building a Q&A community if we first have to get somehow magically organized before we can come to Area 51 and even propose having a Q&A site. If nothing else, it would be useful to have some hints or suggestions to start building a community — and know whether the SE network wants to be a part of that early stage.
For example, I am a Finn and I would much like to see a site for Finnish language (currently in definition at Area 51). I am not interested in starting just any online community concerning the Finnish language, but a Q&A site at SE. It's hard to find followers if I can't show them something they can act on.
As I understand from the announcement, this aspect of community building is outside the scope of Area 51. Therefore I brought this up here on the general meta. My point is not to rant but to make clear what I do not understand about the new site building process; I genuinely don't know how the system is supposed to work at the very beginning.