Sadly Thomas it's a fact of life that everything, ships included however 'famous' they are, have a 'shelf life' beyond which they become too expensive to upgrade/modernise.
Of my ships RN/MN; HMS Nubian was blasted out of the water as a target in 1987, HMS Phoebe was sold for scrap in 1992, HMS Bulwark was scrapped in 1984, RFA Tarbetness was bought by USN and then used for target practice in 2009, SS Oceanic was sold to China for scrap in 2012, Vistafjord went for scrap, Pacific Sun [rightly] went for scrap in China and QE2 - well we all know about her!
The only ships in have worked on that are still operating around the globe are; QM2, QV, Coral Princess, Sun Princess, Seabourn Odyssey & Sojourn, RVS/Seabourn Sun,Prinsendam lives on but in Europe as Amera, Seabourn Spirit is now Star Breeze with Windstar.
Overall not a good record for 'choice' of ships with longevity!