You're lucky you have the E & W HD feeds. Since the satellite laws recently changed, it's no longer possible for D* to offer them, if locals are also available on D* in your area.
Additionally, if you don't already subscribe to locals via D* and call to order them, they will shut off your E & W feeds. If you currently have E & W feeds and locals via D*, you can keep them. However, in the future you may be forced to choose between keeping either the E/W feeds or the locals. Also, if you drop the E/W feeds, you will not be able to re-order them in the future, regardless of your grandfather status.
Bottom line, don't make any changes to that part of your D* subscription!