This seems a lot like linkbait to me. Most of the post is just reiteration of Ghost's features, and the title intentionally asks an inflammatory question.
Definitely linkbait.
linkbait confirmed. The article doesn't really go in to any original analysis or discussion. It's just a re-hash of all the obvious stuff.
To be fair, the article's actual title seems slightly less link-bait-y.
The most recent episode of In Beta with Gina Trapani and Kevin Purdy (http://5by5.tv/inbeta/70) discusses the current state of WP and specifically addresses Ghost. While they make a sound argument that WP has become a bloated mess compared to its humble origins, they point out that Ghost isn't terribly accessible to the general public because it's node.js based and can be complex to configure. Probably not a huge deal if you know what you're doing, but even as a full time web dev, I don't have a node.js server of my own to screw around with.
I don't see anything indicating why someone would migrate from WP to this new platform. WP grew among other things because it was easy to install and 'anyone' could create plug-ins, and now besides there's _a lot_ of themes.
I'm toying with the idea of reusing those WP themes, as in a platform with a drop-in for the themes.