Nowadays all-rope is perfectly adequate.. the only real issue is whether your masthead sheaves will pass the rope.. If the rope portion of your current halyards pass into the mast over the sheave then you're likely good to go. Older wire halyards are likely to have small meathooks by now and getting rid of those is a good thing.
A good low stretch line is easier on the hands and more than up to the task.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"