For me blacklisting is bad idea in general. It can be achieved without blacklisting downsides by using asymmetric keys per user. Where you could rotate keys after things like logout or password change. Keys might be stored in replicated storage, same as session, and deleted/rotated as needed.
Don't get me wrong, JWT it's not silver bullet nor it was meant to be one in first place. It's not session replacement, but there are places where right implementation makes lot of sense.
