The issue with tram capacity on match days is partly caused by able bodied people making unecessary journeys to and from the city centre that they could walk. The trams always get heaving between Piccadilly Gardens & Piccadilly & Etihad Campus, whereas it's easy to walk these journeys in 25-30 minutes. The key should be better signage & more information on these walking routes, freeing up capacity on the trams for those making longer journeys.
Once the Co-op arena opens, there needs to be a better alternative, maybe by opening a heavy rail station on the Ashburys to Victoria line, or a tram or bus link over to Central Park.