Are you likely to have people in your area who know how to exploit KRACK?
I'm in a residential area, so I only have about 6 houses in range of my wifi. And its a dead end so i'd spot a wardriver.
And even then, once they're on, my INTERNAL network is also secured. (file shares have passwords, router has a password, etc).
And I use a VPN for web browsing.
So besides using my bandwidth, I'm not too scared of people being on.