I wouldn't be too worried about the first month figures for Cardiff, although it would be nicer to see higher second month figures.
Anyway, it will have a few good boosts to performance over the next few months, with Ireland playing at least two and most probably three matches in Cardiff in the Rugby World Cup, while Munster have three away ties in South Wales and Cardiff are coming to play Munster in Cork.
Given the sporting links between the two regions, it may be a route that does better in Winter than Summer.