Lemme just give my grandma a list of instructions for doing this so she can get to Facebook. I'll let you know how it works out.
Obviously you'd want to productize it (see WebTV, Mighty browser).
Who's going to pay for that server? We're talking about $50-100 phones here.
webdevs and their managers should use these web "apps" on bad machine over VNC on a slow connection for a few months. these javascript hellpages are basically crime against humanity and do contribute a lot to e-waste, pollution and carbon dioxide emissions