Soo.. With Luke saying "It's time for the Jedi to end", combined with loss of their records and the fact Sith hide knowledge in their tombs and that knowledge usually makes the finder devote themselves to being a Sith to find more...
We win right?
<best southern gentleman accent> The Sith shall rise again.
The Sith hide their knowledge so that only the worthy will be able to acquire it.
I viewed it as technicality; that with the destruction of Sidious and Vader, the Sith are done.
As for the "end of the Jedi"...I think the order will pass to make way for a new Je'dai order. Not light or dark, but balanced.