...I skimmed the posts here. I don't really know what's been said but;
I'm under the impression that Luke is the last Jedi. He'll die, and there will be no more Jedi. Why? Because both Jedi and Sith philosophies are severely flawed, and have led to the destruction of both several times in the past.
The Sith were originally destroyed long ago due to their greed and lust for power. There was always internal fighting, which lead to the Rule of Two.
The Jedi fell because they were far too concerned with pacifism to really do anything.
Jedi and Sith are far too polarized to effectively function. Some of them realized this of course, and used both Dark / Light sides of the force at the same time. A prime example would be Mace Windu. He was more or less a Gray Jedi; using the dark side's aggression in battle, but maintaining his composure through the light side. Then there were Light Sith.
You all probably remember how Mace was fully ready to kill an unarmed Palpatine in Episode 3. He had the right idea. For a moment he put aside Jedi pacifism for common sense. If he had successfully killed Palpatine there, a lot of lives would be saved, the Jedi order would have survived, the Sith would have disappeared for at time again, and Anakin would would have had some sense slapped into him, returning him to the light.
I don't think Snoke is Sith, nor does he want Kylo to fall into the path of the Sith. I believe he aligns more with the dark side, but treads a fine line as to not fall too far. I believe he ordered Kylo to kill the Jedi younglings Luke was training because the Jedi philosophy is wrong.
I believe in the future movies there with be Light and Dark side users, but no Jedi or Sith. That **** was stupid.
Common sense is always better than blindly following a flawed train of thought.