How likely would WIX kill our jobs? Was there a major effect for us on their existence or not that much at all?

To be honest, I believe it helps. Devs can then focus on building more complex systems and non-dev clients can make their landing page site without cost.

Wix and others like it aren't particularly new, they just always were kind of bad. At the moment, they are "less" bad.

I'm all for automation. For any job! Free humans from the burden of work!