I don't think vim-fireplace is dead per se, but as a former vim-fireplace user, Conjure is just a lot nicer. It also helps that Conjure offers support for multiple languages, which enabled me to dabble with Fennel, Racket and Janet without having to install extra tooling.
https://github.com/Olical/conjure/wiki/Client-features
Unfortunately, in the table linked above the CL support in Conjure is so-so. I'm curious what people use for CL or if it's still slimv/vlime.
I did a write up configuring Conjure with neovim here if that's something that's appealing: http://danielwilcox.uk/computers-log-0/