We already know.... This is going to go badly. The typical FCC will find 25GB an acceptable cap. Then companies will lower their caps to "be in line" with the federal guidelines. By raising the threshold companies will be able to cut those rural DSL subscriber much easier.
The FCC never does much to stop small companies from ripping off customers anyway. Our government looks at companies like LISCO, congratulate them for offering 100mbps service, but ignore the 20GB cap.