If you actually got so far as to implement half of what you mentioned, you'd be crazy not to commercialize it.

At some point, you'll need to develop commercial agreements with other corporations. At that point, you'll probably need to have been commercialized.

Also, Amazon already has open source activity around Alexa: https://github.com/amzn/alexa-avs-raspberry-pi

tl;dr: Just decide and get started.