Glass half full or half empty?
I've bene in this position often: there is no obvious reason for changing your bigend if there is no strange noises coming from there. The only reason that they fail is lack of oil.
Alternatively, if you are going to squeeze more power out of your engine it is probably not a bad idea, not involving that much money (conrod + bearing, 150 EUR, plus gaskets for the open / close work on the engine). But, :-) you'll probably find some other items that are sensible to replace if the negine is open anyway.
So, if you're heading for a long trip, replace, otherwise, put back and keep listening to the noises.