my 2 cents again: I would get the plugs all changed and the wires checked as a peace-of-mind thing. Yes, maybe they can last 100K miles, but it's all boils down to what you think you can tolerate.
I had the plugs and wires changed on my '99 F350 at 30K miles. They also told me they used Marine grade NeverSieze on the new plug threads, just in case I ever wanted to pull the plugs again. My plugs didn't look too bad, but judging by their appearance, I was glad I changed them at 30K miles.
My dealer had my truck for two days to get the job done; -but they had the tools & techniques so they didn't have to use heli-coil inserts with the new ones.