Adding the Bitcoin symbol to the keyboard will scream "ADOPTION". The question is where to put the key? I would suggest they replace the $ with the bitcoin symbol... just kidding. However, it gotta go somewhere, what do you think?
Depends and would vary if manufacturers would consider on putting it out not only with KB but also in the command itself on which it could print out that Bitcoin Logo.
We arent still into that certain state of adoption for such add up but who knows if we would able to see this stuff anytime soon.
For now lets not put up some hopes into it but it would be good if ever it would be applied.