There is definitely a need for a low cost GP micropython board.
I would suggest to make MMA7760 an option to reduce cost further.
You can now get very powerful nano Linux SBC's with multitasking , WiFi and full python or whatever you want to program with.
For less than $13:https://www.seeed.cc/LinkIt-smart-7688- ... 650.html#!
And with integrated Arduino AtMega3 processor for real time I/O and control:https://www.seeedstudio.com/LinkIt-Smar ... -2573.html
These Linux SBC are in a different category, but considering the power and features are ridiculously cheap.
Do you have a price and when are you going to sell it?