Water pump, Idler pulley replacement while having access?

[togglebolt]

Hi,
My 2004 6.0 Powerstroke (120k miles) needs a new AC compressor and after a days struggle I've removed all fan shrouds, fan & radiator to facilitate replacement of AC compressor. Given the effort I'm wondering if I should replace the water pump and idler pulleys while having full access. As of now they are all fine but it seems like a good opportunity to get it all replaced, but I have no idea what the duty cycle is for these parts. I do plan to replace serpentine belt, radiator hoses but not sure about the water pump & pulley's that will get buried after reassembly. I plan to keep this truck for many more years.

Thanks,

Togglebolt