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Any bearings can fail at anytime even new upgraded bearings, just luck of the draw, I am running a tapper roller bearing on my lay shaft and has been in there for a very long time now, I was at a shop down Sydney that built race bikes and the tapper bearing on the lay shaft was design for quick change the gears for different tracks, the shaft and gears could be pulled out together and the owner gave me the new bearing, well it's been in my gear box since 1984 and still in there today, I don't know if it is a quick change as I never needed to change my gear ratio, since 1984 but I only been back inside my GB to replace worn KS pawls 4x then replaced the kick start gear where the pawl engaged that was worn and caused the pawls to wear out quick and a broken KS shaft, that was over 30 years ago.

But any bike that has sat in a barn for a long time it would be wise to go through everything, gear box included.

Ashley