This stick can be very useful in many games...
Else, a wireless module will be helpful to enable multiplayer, online scores, play with players of the entire world, save progress online etc. etc.
![Wink ;)](./images/smilies/icon_e_wink.gif)
A bluetooth module is less helpful because it "just" permit to play with players which are in a very limited area... In the same room for example.
What is the cost of these three modules ? If the price is too high, it's futile... I don't want to see the price of the Gameboid pass from 35 $ to 75 $ just to have a stick and a wireless controller ! But if you've continued to develop this idea, I suppose the price is not really a problem ?