I don't have any experience with Qt&QML, though I've heard lots of good things about it.
I don't think a wholesale replacement of HTML/CSS is feasible though. There's just too much inertia behind the incumbents, not to mention that HTML/CSS is very good for the document centric web which applies to 90%+ of the existing web.
More flexible CSS layout modes such as display:flex are quite usable and go some of the way to addressing app-style layouts, however movement on these standards is slow and doesn't go far enough IMO.
I don't think a wholesale replacement of HTML/CSS is feasible though. There's just too much inertia behind the incumbents, not to mention that HTML/CSS is very good for the document centric web which applies to 90%+ of the existing web.
More flexible CSS layout modes such as display:flex are quite usable and go some of the way to addressing app-style layouts, however movement on these standards is slow and doesn't go far enough IMO.