You get that anyways. The question is how popular something like tokio will get. Since its blessed by the core team and the language designers, I think it will

You get that anyways. The question is how popular something like tokio will get. Since its blessed by the core team and the language designers, I think it will get popular, and therefore many will use it. But there will inevitably be someone who doesn't like it, or for whom it doesn't fit, and they will use something else. But that happens no matter if tokio is in the stdlib or not.