Languages, much like startups, are usually successful by focusing in one area and growing that first. The "$LANG in 30 minutes" format seems to play more to a general audience, which I fear will lead to a whole lot of people saying that it looks neat, and maybe they will get to it later.
It might be better to publish a lot of stuff about a single topic, where it can attract interested groups and build enough that it actually proves the merits of the language.
If I understand it correctly, the intent of this format is to let the reader pick up enough of the language to be able to read code without getting frustrated. I think this is a good goal, and there is indeed some value in it. These languages are complex enough that articles in this vein are useful. They are not, and -cannot- should not, replace documentation and tutorials.
It might be better to publish a lot of stuff about a single topic, where it can attract interested groups and build enough that it actually proves the merits of the language.