The "next level" of adoption comes from third-party integrations and services that actually bring utility to the currency. A bundled GUI doesn't deliver any compelling new use cases, and won't result in any new adoption outside of Bitcointalk users and their close relatives.
What about the idea that poor ease-of-use serves as a deterrent to third party integrations and services?
Exactly. Integrating a highly technical, steep learning curve coin is a losing proposition for a firm if it creates a user support nightmare for their help desk.
The amount of customer hand-holding needed would destroy any possible profit. That's probably why Polo hasn't added Decred.
Johnny doesn't seem to realize adding a coin with no GUI is basically volunteering to teach a potentially unlimited number of n00bz everything from Command Line 101 to the theory of functions, and how that all relates to RPC, daemons, etc.
Of course potential 3rd party integrators will tend to respond with the polite euphemism for "no way; not on your life; GTFO."
