At present, BlazBlue Central Fiction appears to be the most recent game, but the possibility of future entries depends on various factors such as fan demand and the developers' creative vision. So, we can't definitively say it's the last one.
For some gamers, BlazBlue Central Fiction is totally worth it. It offers deep gameplay mechanics, a rich story mode, and a wide range of characters to master. However, if you're not into this genre, it might not be for you.