Do you mean from a technical or business perspective? Technically Comcast could implement it overnight by reducing everyone's data speed (or maybe throttling p

Do you mean from a technical or business perspective? Technically Comcast could implement it overnight by reducing everyone's data speed (or maybe throttling particular services), or instituting stricter data caps. From a business perspective it's harder but if it was the only way they could keep their network afloat, I'm sure the could get the FCC to let them implement emergency throttling.