...For the same reason Miranda outlasted Constitution?
Three ways to apply pseudo-logic here:
1) The Nebula is the no-frills version, thus built in greater numbers, thus more likely to survive in decisive strength till such a point where Starfleet has to decide whether to produce another big batch or not.
2) The Nebula is the development of the Galaxy original, thus marginally newer, thus more likely to survive till such a point yadda yadda (although we have seen lower Nebula registries than Galaxy ones, actually suggesting the Galaxy is the bells-and-whistles spinoff of the Nebula original).
3) The Nebula, being the no-frills ship, has to embark modular gear in order to perform missions the Galaxy is already pre-equipped for - which makes it easier to keep the equipment up to date, with modular swaps, and thus allows the Nebula to serve on when the Galaxy gets outdated by virtue of her aging onboard equipment.
Of course, it's equally easy to invent opposite arguments if we want to prove the Nebula will disappear first - which might be a good idea because we have seen "future" Galaxies but no "future Nebulas in flashforward episodes.
Timo Saloniemi
Three ways to apply pseudo-logic here:
1) The Nebula is the no-frills version, thus built in greater numbers, thus more likely to survive in decisive strength till such a point where Starfleet has to decide whether to produce another big batch or not.
2) The Nebula is the development of the Galaxy original, thus marginally newer, thus more likely to survive till such a point yadda yadda (although we have seen lower Nebula registries than Galaxy ones, actually suggesting the Galaxy is the bells-and-whistles spinoff of the Nebula original).
3) The Nebula, being the no-frills ship, has to embark modular gear in order to perform missions the Galaxy is already pre-equipped for - which makes it easier to keep the equipment up to date, with modular swaps, and thus allows the Nebula to serve on when the Galaxy gets outdated by virtue of her aging onboard equipment.
Of course, it's equally easy to invent opposite arguments if we want to prove the Nebula will disappear first - which might be a good idea because we have seen "future" Galaxies but no "future Nebulas in flashforward episodes.
Timo Saloniemi