I am sure the Oscar Wilde is a tourist ferry but I would not think it is the biggest earner in the fleet, Freight pays the bills but the likes of Superfast XI to hold the passenger market but expand the freight market. I personally see there is scope to Hold the Oscar wilde for seasonal and cover work but the likes of superfast II to cover an all year service freight market and possibly open a Spanish route.
As I say I would put the Superfast I in Rosslare - Pembroke but I think there is lenght restriction on Pembroke so She could still cover Dublin -Holyhead, as her lane meters are closer to Epilson and with much better passenger facilities but still providing adequate PC of 950.
I do feel the IOM is too big for Rosslare - Pembroke especially her 2,200 PC and her 2,000 lane metres.
I do feel Irish Ferries will take a short term solution with a long term solution to come.