What exactly is GNOME going to do about web browser as core functionality the GNOME OS future? Html5 based apps are only going to grow in importance, especially in the infotainment consumption use case that the tablet form factor seems to fit very well.
Amd there's still a significant point that GNOME as a project needs to address concerning the definition of a coherent API and SDK story that can be breadcrumbed to application developers. Application developers will need to reuse as much of the code silo that underpins Shell to minimize resource consumption as application developers build task specific applications for the post-desktop form factor usage cases. Android and iOS both lay down a pretty strong preferred SDK storyline for incoming application developers.