It's not the FCC that wont allow Dish, or any other carrier for that matter, to carry broadcast network feeds. It is the broadcast networks themselves that will not allow it! If ABC, CBS, NBC, et.al. decided that it was in their best interest to open the network feeds to the cable and satellite distributors, it would happen TOMORROW! (or the moment the affiliation agreements expire with the locals).
Fox decided to have direct distribution in areas where a local affiliate was not available and they have/had FoxNet (I saw it in PR.) WB and later CW wanted wide distribution and they put their content on a channel that was nationally available WGN Superstation (now WGN America). The INSTANT the CW had enough local channels to cover most of the country the CW pulled its programming from the superstation and it was only available on the local version of WGN
PBS has a national feed (PBSx) and they make it available to satellite and cable subscribers in areas where there is no local affiliate right now.
Ion, TBN, Univision, Telemundo, Azteca America are all U.S. Based broadcast networks that make their programming available to cable and satellite distributers. They don't have to, but they do. ABC, CBS, and NBC could do the same, but they don't.
For the 1,495,675th time, major Broadcast Network feeds (ABC, NBC, CBS) were NEVER... repeat after me, NEVER made available to cable and satellite carriers. Some one essentially decided, on their own, without permission from the station or the content owners, to uplink a local channel and make it available for redistribution early on in the days of satellite. It took 20-30 years for the EXISTING laws to catch up, but now no one can just grab a signal off the air and put it on a satellite uplink without permission with extremely narrow exceptions, like the 5 remaining so-called super-stations. And even those exceptions are highly limited by the owners of the content (programs) available on those channels. All the laws passed by congress to allow satellite to carry local channels and to keep super stations were actually laws the PUNCHED HOLES in the existing copyright laws protecting the stations from unapproved redistribution.