This is definitely feasible in Bevy (either via Rust codegen, "interpreter-style" node execution, or scripting). And will be even more feasible once we have an official visual Bevy Editor. However I'm pretty skeptical of "visual / node based programming" and I wouldn't personally prioritize that work when we have so many other things to do. That being said, I'm guessing someone will eventually build a 3rd party plugin to do this.