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I voted yes, if you are in there, a part is suspect, I would replace it. I would do a little comparison, between how much trouble it would be to get back into that part vs how much it costs. If the part is very hard to get to, like the coolant expansion tank, then I might pre-emptively replace it if I had the transmission down to do an IMS replacement. Something like an ignition switch, I would replace at the first sign of trouble because I wouldn't want to get stranded. Something like a broken microswitch in the passenger side door that requires me to lower the window a little before letting folks in and out, I have been holding off for the last two years because it is not that big of an inconvenience...
Here is a related scenario - I am going to go in soon and install an underdrive pulley. Will I do WP and Thermostat when I go in there? I don't have any record of it ever being replaced, but I don't have any leaking coolant either. I will probably wait to do the UDP until I don't have anything coming up in the next few weeks and take a look at the WP, see if there is any evidence of seepage, or any play in the pulley, and if there is any sign of anything I will replace. If no sign of trouble I will probably wait for another day.
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