I'm wary of how effective the glasses would be but the potential even without the translation feature for someone like me who was visually impaired would be enormous if they worked. There are already apps and services via smartphone which claim to OCR things such as menus but having it built into glasses would be very convenient, plus the additional ease in recognising who just said hello to you when you didn't recognise their voice (which can be very difficult in a lot of cases) would be absolutely fantastic.
As for 5G, meh. I can't even get 3G here and even if I could 500mb of data a month wouldn't go terribly far.