I really like the idea of the PCs being stationed on the last ship of her line...it's the one where the project managers at ASDB had the really wild party on...and the crew were still finding the remnants of that night weeks later... But I digress.
After building a class of ship for so many years, people get attached to the design, and it's always a moment of celebration/reflection/sadness to see the last ever ship pull out of the yards.
I would expect it was that way when they built the last Thunderbird in the mid-90s...or when the last F-104 Starfigher rolled off the assembly line.
It makes the ship special in that way.
Davy Jones
"Frightened? My dear, you are looking at a man who has laughed in the face of death, sneered at doom, and chuckled at catastrophe! I was petrified."
-- The Wizard of Oz