Very bright. As in, a bright idea. Bitcoin is a bright idea which will enlighten the world.
Meh, bitcoins have some nice features, but they are still limited to a very small number of transactions (relative to the total number of transactions made globally), and the massive size of the ever-expanding blockchain seems like an inelegant solution.
Not every transaction has to go on the blockchain for bitcoin to be successful. I do not think everybody in the world will use bitcoin exclusively, but I do think eventually everybody in the world will know what bitcoins are, and accept that they have value.