According to Wookiepedia:
The Force - Powers & Abilities:
I would avoid the names of "Jedi/Sith" completely and use something else since their era is now over.
Their religious view on "The Force" is now a remnant of history.
It's time that new Force Religions & Views take over.
Force Usage is generally inheritable in most cases, in a worst case scenario, it skips a generation if you are using clones.
See Above for details.
Now imagine if all 10,000 of those Jedi Knights were in a different program / Force Religion.
One where they were allowed to have normal relations while learning & training in "The Force".
Then over 1000 years, there would be so many Force users, that it would be pretty common sight in the Universe to see "Force Sensitives".
In fact, it'd be so common, that people would WANT to marry into a Force Sensitive family so their children can benefit by having force powers.
It'd be highly desirable to marry into that type of family for all the abilities it could pass onto the next generation of children.