Interesting question.
On one hand you only should ever intend to be in there once, so why wouldn't you, a new set of bearings should now outlast you, given how long the old ones lasted.
On the other hand, as I know from experience, however expensive a set of shells from Japan look now, wait until you add P&P, Duty, Vat etc, it will make your eyes water.
Plastigauge then decide, I reckon. Also you have to select the right colour shells if you replace, but there's people here to help you with that. You can also have fun looking for the near invisible scratched on codes on the crank cheeks, from when they measured the crank journals in the factory.