I'm no expert, but I don't think they are in that good a shape? Original engines and props, and although very well maintained, have been worked hard for 35 years. I know that alot of steel replacement work was ongoing too, including the hull.
Maybe they would follow in the footsteps of 'Lymington' and 'Freshwater' and end up with Western Ferries? If I had the money, I'd buy two of them and run them between Portsmouth and Gosport...I'd make a fortune!