If you are willing and able to replace the head gasket then i wouldn't bother.
Why go to the time, effort and expense just in case it might possibly become a problem at some point in the future?
Personally i'd wait until that time, whenever it might be...could be 3k...could be 30k, might be never.
I have a fault flow chart somewhere with the first line being "Does the damn thing work? --> Yes --> Don't bugger about with it"
Stood me well that advice, well at least till i bought a fronty. Its infectious you know
