AnoopSharma I absolutely love the idea and it would be amazing if devs can give an option for this kind of layout for discussions.
As far as the doubts about having less space on mobile then, take a look at Instagram, youtube and most blogs, these all show big images with a short summary but still, people use these platforms more and more. It's not just about displaying more stuff on a small screen, but to display smartly and beautifully so that people would enjoy spending time on the website. So yes, this kind of layout will help a lot to those websites which have a lot of images.