Insufficient Data
for a judgment. How much decay is in there? If you care enough to stop and take pics of the plates, why not take the time to remove the rot and measure the cavity?
Ticking time bomb, my asteroid. You guys see a little decay and say it's inevitable to spread and wreak havoc on humanity. Trees are not defenseless; they wall off decay successfully every day. Why not work with that energy instead of firing up your chainsaws at the drop of every roach turd?
Sorry Dan, not too late. Hey, Free concerts at ISA; I'll start a new post on that.
If they have economic sense, the owner/manager of the tree and wire will use diagnostic tools first, possible cable second, chainsaws last.