I don't know. Maybe to be in the top 10 on TIOBE index? It's paradoxal that you have this superior paradigm that not only is not dominating but it's not even in top 5 languages that are used. (Not to mention that all dialects account for that 13-th place, so if you disperse percentage on all of them - they are of the chart)
I didn't try Compojure, but Noir seems succinct enough. It's just that functional programming doesn't blend well with my brain. For some problem it does, for some it doesn't. Since you mention performance, I am wondering and was not able to find any benchmarks in Noir vs. Sinatra for rest server for example.
Why do you think it obsoletes Ruby&Python? It does target Ruby developer with borrowing some syntax, but the paradigm shift needed to jump on the "functional" train is quite big. It is nice language but it solves the problem that I don't have (performance&concurrency) so I am not all that eager to make a switch.