Ransomware, like the old data trashing viruses of the past, is trivially defeated by having backups.

Read up on the mechanism by which WannaCry spread and report back.

You mean EternalBlue? How exactly is a remote attacker going to use a vulnerability in a local networking protocol to attack a typical home user's PC? First you need a way into their network where you can even see the PC to attack. If you have that then you're already dangerous.

As I said before this kind of vulnerability is still a concern. Obviously it's a much greater concern if you're talking about something like a laptop that might be connected to an untrusted network, which would be crazy with an unsupported or unpatched OS. But for a home user who stays on their own network it's probably quite a long way down the list of things to be worried about.

We also dont know if some bad actor has already found that vulnerability and are building/already built and exploit.