What I would like to do is start a series of definitive reseach and data collection forum threads that could be quick references to the new developers on what we, as the fans, are expecting from STO.
As good a place to start as any, please discuss which ships from Starfleet and other races should be featured in STO. Please be realistic. Assuming that the new developer follows the previous path and sets STO in the future, there obviously would not be an NX Class flying around.
So, I'll get started by listing the classes of ships I believe would still be in service in 2404:
Sovereign
Galaxy
Prometheus
Intrepid
Defiant
Nebula
Nova
Akira
Danube
Delta Flyer
Norway
Saber
Steamrunner
Classes that could be in service, but should be limited due to age, and ready to be decommisioned:
Niagra
Freedom
New Orleans
Ambassador
Centaur
Classes that should only be in the Starfleet Museum:
NX
Constitution
Excelsior
Miranda
Oberth
Constellation
Soyuz
I know this may make me an unpopular fellow. After all, the Excelsior and Miranda classes are quite popular, and yes, they were seen in the Dominion War.
However, if the year is 2404, and we saw so many of these ships in service during the Dominion War, it would stand to reason that their numbers would have been heavily thinned, and eventually Starfleet would have put them out to pasture.
Fact is, they do not belong to the modern Trek era. They don't look right when sitting next to a Galaxy class or Soveriegn or Nova class vessel, there is no reason to believe that they would be able to accept all the technology upgrades necessary to make them modernized, and after over 100 years of service, everyone deserves to enjoy their old age!
I would say that if the devs INSIST on using the Excelsior or Miranda classes, they should have very limited duties and capabilities, such as patrol assignments in the Sol sector and diplomatic runs to places like Vulcan, Q'onos, Andoria, etc.