I don't believe there is much in the way of fire damage in the park itself this season.
Fire is, however, as much a part of 'nature' there as is anything else.
As for waiting, if there were damage and you wanted to wait to it to over grow, you might be waiting for a while depending on the type of fire. The forest fires of Yellowstone a few years back, were interesting. Undergrowth and new trees restored the area quickly, in my mind, though you will, of course, still see stands of trees which were killed by those fires. But the new growth underneath them is both striking and encouraging. Fire is, however, as much a part of 'nature' there as is anything else.