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, probably there are already people out there that created a customized keyboard that has bitcoin symbol on it (other than or with the dollar symbol). Though being it to became included to the "standard" keyboard format, I think it is possible after few years. They say usd is crashing while btc is being adopted, maybe that's the time.