It seems that every time I have a new 'binge' at using the likes of VirtualBox or VMWare (the Type II version), they've introduced even more high-level features, often ones that remove layers between guest OSes and the host system. They realised early on that emulating the x86 was too slow, so they pretty much gave the CPU directly to the guest VM. They then realised that giving direct access to DirectX and OpenGL would increase performance, so they granted direct access to that too. Then they added more desktop integration, more seamless copy-and-pasting, etc. It goes on.
So, whilst Type II hypervisors are granting lower and lower-level direct access as well as more high-level desktop integration, so often are the applications running within the guests: before, DirectX and OpenGL was the darling of game developers, but now even web browser developers can't keep their mitts off it. So even things like web browsers are using functionality that is being 'handwaved' through the sandboxing layer of the hypervisor.
Is this trend turning type II hypervisors more into 'enablers of co-inhabiting OSes', and if so, should we be concerned at the weakened sandbox this presents?