Well, for non-data-consuming devices, USB1 is enough. (touchscreen, gps and so on). For DVD usb1 is too slow: USB1 is 12Mbit max, which is in the real world like 800k/sec or so. DVD (1x) requires about 1.2Mb/sec or so.
Besides, connecting a USB2 device on a USB1 hub causes windows "to panic": It keeps on mentioning: Fast device connected to a slow usb hub, kinda annoying.