From what I saw Cosmic has a lot of potential and looks pretty sleek too, right now I'm using KDE it's a great desktop, but now that I have a second monitor it randomly crashes on me, I think I'll switch to Cosmic when it reaches beta.
It's new and different. It's also not really usable atm so there's plenty of hype and little disillusionment yet.
Give it a couple years and everyone will probably have forgotten about it.