Piss poor ship internet ate half my post and I didn't even notice.
I was going to continue that you can probably expect 20+ ships (of varying sizes) for each Star Destroyer/capital ship. That would give you (for the One Sith) a total fleet (from frigates on up) of around 15,000-20,000 warships. Most of these are cruisers/frigates in size, and it doesn't include local system defense ships, auxiliaries, support craft, etc. Nor does it include smaller vessels.
This still comes out to several hundred ships per system on the map (somewhat less if you figure that there are unnamed systems under Sith control that are simply too irrelevant to list, not sure if that's generally perceived to be the case or not) which frankly is a lot. Maybe too much, I don't know, but Star Wars tends towards the absurd extreme when it comes to numbers.
As an aside, you can probably assume there are hundreds of thousands of civilian ships for every military vessel. Say hundreds of millions in the galaxy overall.
Now, this is for what is now the largest and most powerful faction on the board. Other major factions would have considerably less overall, but probably enough to reasonably field a similar-sized fleet in any given situation. Where does a minor faction fit in? Hard to say, but you have to consider vastly limited resources and much smaller sphere of influence.
Remember that a classic Star Destroyer (1600m) is a MILE long with a crew of tens of thousands. A 'small' 400m frigate is 1300 feet long, bigger than a modern Nimitz-class Aircraft carrier (that carries a crew of roughly 5000).
With that in mind, I would figure that a very prominent, powerful, and old minor faction might have a few hundred ships total, mostly of the smaller variety. Supplying and equipping any more than that simply requires such a substantial number of resources that you very literally need entire planets to support it.
Of course does any of this impact RP? Not at all, and that's probably a good thing, because this is only MY interpretation of the whole number game and someone else might have very different ideas (see, the Black Fleet situation).
Bear in mind I find the numbers from the Black Fleet to be relatively reasonable whereas I find the concept of the Empire having 22000 Star Destroyers to be downright absurd.
All things considered, the above is based heavily on real world numbers of ships and so on, which while reasonable (to me) may well be totally off base when it comes to factoring things for Star Wars. So we arrive at the start again and I find myself forced to concede that the rules as listed are basically the best you're going to get.
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