There were cracks in the building before and they decided some maintenance and fixing was needed. Ironically, there was some talks about how much it's costing to fix the building before the fire broke out.
Those old buildings need a lot of upkeep and money thrown at them, but then, imagine the money they are bringing in via tourists? I don't know about that one, but the cathedrals here, like St Canice's in Kilkenny city charge a small entry fee. It's well worth it though! When I visited it about 2 years ago we went up the adjacent tower and the view was worth every cent.