I know it goes to Victoria as it is, but it wouldn't require a tremendous amount of engineering to connect Picadilly too. If they reconnected the fork from just before Ardwick station to the Enterprise on Ashton Old Road, you could have a direct route from Picadilly that I guess would take about 3 mins in each direction. Although it would give Manchester a loop between Pic and Vic, it would involve (re)building two small bridges, so its not going to be cost effective for 20-30 events (matches and concerts) a year, but maybe if there was an arena.... Even running a train as far as Ashburys, then running it in the other direction and going up the other fork at Gorton Road would be a solution. I suspect Northern wouldn't have the spare capacity though anyway.