Yep, I think cohesion is only going to die going forward, and I think web technologies are going to be what kills it. Electron is already popular, and nowadays every platform has a system web browser that can run in a "webview" mode so you don't have to bundle a full browser with each app. And building apps with HTML/CSS/JS is wayyyyyy easier than using native toolkits or cross-platform toolkits, especially if you want to target multiple platforms.