Doesn't change anything.
Think about actually implementing this, you have no feedback, you have no idea what OS they are running, you don't even know what computer you are attacking, and you can only do one computer at a time.
Yes, it could be scripted to attack any OS that's vulnerable, but you are still blind, not sure who you are hacking (even with a directional antenna) and limited to one connection at a time. Frankly, most computers have very little on them worth that kind of time and effort. Should it be fixed, yes, people have known about the lack of encryption on mice and keyboards for a while, but it's not a serious problem for the billions (which is a stretch) they claim to be at risk. You are far more at risk of someone using a keylogger and reading your keystroked than someone doing this hack. Which by the way is why companies are updating the firmware, not because of these guys.
Remember, these guys are making it out to be bigger than it is because it's a startup security firm "hoping to cash in on its security flaw findings". All they really did was theorize a new way to take advantage of a previously known flaw. It's not even clear if they even managed to do what they theorize, only that they detected the signal.
As for the distance...
They used a 2-4db wifi antenna instead of the normal dongle the mouse uses which is like .05db, which is why it had the range of a router. If you watch the video, you can tell they used a usb wifi adapter with a 2db removable antenna, looks just like the Rosewill I have. Keep in mind, that their distance was line of sight, which is a best case scenario, businesses and homes have walls. Your router can probably go 150 meters too, especially in an alley with direct line of sight, but odds are it barely leaves your property because of the walls.
Want more? Make a Pringles cantenna, it's an antenna made from a Pringles can... These are 5-9db antennas capable of transmitting 2.4ghz up to 7 miles. You can buy pro made cantennas that will reach closer to 9miles, common satellite dishes are capable of up to 24 miles, and the old 9 footers can do 100miles. All of these hook right into the Rosewill using a common cable you could buy at Radio Shack, Amazon, or Ebay.