The one thing about Star Wars that baffles me more than anything else is why the Jedi Order would forbid its members from having families. Seriously, who decided that was a good idea? Think about it; they systematically brought all the most Force sensitive beings in the galaxy together in one place and ended their genetic lines. This would effectively breed Force sensitivity out of the galaxy.
I think this is the real reason so few Jedi survived to the time of the original trilogy. The Sith didn’t bring the Jedi Order down. Poorly thought out eugenics did.