Faster speeds are less about benefiting the subscriber and more about marketing. What is the point of having ungodly downstream speeds when you reach your limit within a couple days. Most servers dont allow you download that fast anyway. 250GB may be a lot of data by today's standards but looking forward it could be considered minuscule. Up until the late 90's 1.4MB floppies were dominant. Now usb flash drives up to 64GB are available. I do not believe comcast has intentions of keeping caps up to pace with the rapid improvement in technology and digital distribution trends.