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?
I don't think it would take just 1-2 years, I do think it would still take a lot of time for the Bitcoin symbol to be added to the keyboard, since this is something which is governed by highly centralized companies and them having such open thoughts might be a delusion.
You can't even find bitcoins in emojis tho. But another thing I got to know from google apparently :
The Bitcoin sign is part of Unicode 10.0 (released June 2017) with code point U+20BF (₿). As of June 2017, font support for the Bitcoin sign is in macOS Sierra, iOS, Android O beta, Windows 10 Creators Update and several Linux releases
/Taken from google/
Other than that I tried finding how to get it on your keyboard as well and apparently if you are using Microsoft word then you can very easily do that :
Hold the alt key and type 8383 using numeric keypad to type Bitcoin sign ₿. Remember to enable number lock key when using numeric pad. Type 20BF and press alt + x keys to convert the code into ₿ sign. This method works in Microsoft Word and you can use regular keyboard keys
/Taken from google/
That means that just few updates and it should be out in the market against dollars but the companies doesn't seem like they wanna do it. But we still have other ways to use it therefore not a big deal.