A single page web app?
That's all most of these are. Particularly the Slack/Hipchat/Discords of the world.
> People are excited about the Desktop again
If by desktop, you mean "need to be connected to mains power to run for more than 10 minutes", yeah, people are excited for desktops again.
Electron only really makes Javascript developers happy; they don't have to learn another language or framework to make "desktop" apps now. As a consumer, I fail to see the value in having to download large single page webapps that are equivalent (or worse) than their online counterparts.
Cross-platform applications like Chrome and Firefox and Steam and Doom and Factorio and... these have existed for years, and so have cross-platform programming languages and frameworks. Java, TCL, Qt, Flash... Electron is simply the lastest in a long line of cross platform frameworks, which is currently in-vogue with developers solely because it uses HTML and JavaScript.