The push for these crazy fast SSD’s when even a SATA3 SSD would be a huge leap for load times isn’t just to reduce load times but to allow on-demand streaming of assets just in time. An external HDD isn’t going to cut it for the random reads developers looking to get the most out of the hardware are going to be doing.

Archiving games you aren’t currently playing because a USB hard drive is most certainly the faster option for anyone without a gigabit internet connection? Sure. But there’s no chance in hell they will let you run games off one.