Some perspective here, please:
The fire is a huge one, and it's close to Mount Wilson, but it didn't get all the way up to the towers overnight, and that gives fire crews a chance today to create more fire breaks and drop more fire retardant from aerial tankers.
Even if the fire does get all the way to the top of the hill where the towers are, it would take one enormous blaze to actually melt everything up there. Most of the towers on the mountain are self-supporters, so there are no guy wires to melt, usually the first point of failure for towers that are affected by fire. As long as the towers survive, it's relatively easy - comparatively speaking, of course - to put up new transmission line and bring up replacement transmitters.
Most of the FM stations on Mount Wilson have auxiliary transmitting facilities at other locations in the market. They might not have the commanding signals they have now, but they'll remain on the air for most of their listeners if the worst happens.
Cable/satellite penetration in the LA market is about 86% - so most viewers wouldn't have any disruption if the Wilson TV sites are lost.
But again, the reality...at least as of noontime Monday out west...is that things have taken a decided turn for the better out there. All the engineers are down from the mountain and safe, as are the staffers of the adjacent Mount Wilson Observatory. There's not much to be done now but to wait and see how this all plays out - and of course to hope for the best.