WPA3 won't fix it, but it will sure help
Not only will it fix the known attack on WPA2, it will encrypt passwordless wifi as well as passworded.
You should still make sure something secure like HTTPS or a VPN is in use if you are connecting to anything where you wouldn't want the traffic sniffed - but that's already true for most things. You'd have to work hard in 2018 to find webmail, online shopping etc. where you can enter a password or credit card number in the clear.
Think of it this way - everything that's in the clear on a passwordless wifi today is in the clear when you are sitting at home once it leaves your ISP. The odds of getting sniffed at internet exchange points by the NSA or GCHQ is probably 1000x greater than getting sniffed by someone sniffing your wifi in the coffee shop. Worry about the right things!