Dry rot is attacking my neighborhood. I've caught mine early and am defeating it through a combined application of caulk, primer, paint, and roofing sealant. None of it has gotten inside so far because it's been entirely confined to a few square inches of exterior trim. But some of my neighbors have obviously left their eaves, soffits, and other wood trim go for far too long. When it gets to the point where the trim on your eaves is eaten away or twisted up, that fungus has spread into whatever wood that piece is attached to. If it's your attic with all of the roof framing and the roof itself, you're basically screwed as badly as you would be if a tornado lifted off the roof of your house.
The houses that are the worst are invariably the ones that have multiple vehicles, new SUVs, and such out in front. It's sad because the neighborhood overall is pretty nice: brick, pitched roofs, and easy-to-maintain properties that have appreciated well and that aren't too oversized.
I've warned a couple neighbors who still have time to save their homes.