Probably not. The overarching security concern with WebGL is that much of the complexity in e.g. compiling shaders or loading data into GPUs is happening in kernel code. A lot of it is driver dependent, so even if userland code gets everything right, there's a good chance that a sizable chunk of people are using drivers that aren't resilient against attacks. Finally, it is a lot easier to update a browser than it is to update a kernel video driver, and a decent chunk of the browser security model depends on browsers being automatically updated when vulnerabilities are discovered.