Don't have any experience with Nim, but I share your interest for the same reasons. Haskell and I don't get along, maybe I'm too old and set in my ways?
Did you catch the link to/discussion of Little shared on here a few days ago? It might be of interest. https://news.ycombinator.com/item?id=11530097
I'd say it's not a good language to go with today for same reasons I'd say Tcl isn't. It's an interesting improvement especially to get better syntax with legacy compatibility with field-proven, TCL modules. And TK is still the shit for portable, easy-to-build GUI's. A TCL shop should definitely experiment with it and maybe incrementally upgrade their code. I think I'd be fine with a more typed, efficient, and fixed version of Tcl for some apps. Especially a command shell replacement or prototyping system.
Just not production unless it's non-critical like what you use it for. I don't even use it to glue to critical things as the glue is part of the TCB to a degree. Gotta find close-to-metal, abstract, typed, efficient, and macro'd stuff to replace it. At least we have contenders.
So, there you have it: REBOL, RED, and Nim. Maybe Ivory language from Galois, too, but you need to know Haskell for that.