one of the things that keeps me from using Bluetooth for peripherals like mouse and keyboard is that it's bad and doesn't work well. If they improved on that problem I would probably use them
although i disagree with him on quite a few things, Wade from dankpods really summed up bluetooth quite well: it introduces a new way for the computer to fight you when you want to do something.
you plug a 3.5mm headphone into a computer it works. no questions. any problems that might happen would certainly happen with bluetooth as well, but using bluetooth introduces approximately 8.9 trillion more things that can go wrong.
same goes for usb keyboards and mice. your OS has to be catastrophically fucked up to not get the HID interface right. it just fucking works. bluetooth adds so many more ways where it doesn't work, and you aren't told why.