I think it's rather ironic that for many years, the browser as a platform has been moving closer to the write once, run anywhere goal, yet the platform specific "app" has suddenly taken the world by storm. It's a bit like stepping back to the pre-Internet days.
Maybe HTML 5 will get the software industry back on track, but with Windows 8, we now have an "App" trend on a PC platform. Certainly PC-based applications were platform specific before Windows 8, but more and more application, especially low CPU strain applications had been moving into the browser. With Windows 8, we now have another major push away from platform independence.
James did not specifically reference solitaire. Assume that under this vision you will be able to play solitaire on multiple platforms securely and be able to stream results directly to the cloud for storage. :)