Wendell has it spot on with his letter to the FCC, i have already mailed mine out. Except that i took it a step further, i sent messages and called my Local ISPs that were providing cable internet and very kindly urged them to think about the future and invest in fiber. The ISP that i get my 50mbps internet from is a local hometown ISP with the nicest tech support you'll ever talk to.(I live in Tacoma,WA and have Advanced Stream)
Thankfully I am lucky enough to have more than comcast in my area, but not so lucky to be living in Seattle with GigabitSeattle or in areas with Google Fiber.
Make a difference, and if you send a letter be very nice, and make it well constructed. Things will change eventually.