The one major component of the mythology that the universe operates in, in this setting, is that the Force provides balance. There's a solid argument that Vader was prophesied to bring balance by murdering both sides, and resetting the scale, so to speak. And that's how it worked out, in the end. In Eps 7 and 8, there seems to be balance, if you consider Snoke and Luke to be dark-mirror analogues, and the same for Rey and Kylo Ren.
Frankly, they don't need an organized force to try and produce that balance, and the Jedi's attempt to create such created imbalance. Hence Vader murdering them all.
This is sort of the entire point that The Last Jedi is trying to drive home. Without the Jedi Order, there wouldn't need to be Palpatines and Kuns to oppose them. Balance.
I wouldn't be totally shocked if Episode 9 involves Rey and Kylo becoming largely "grey", learning to be in control of the dark sides of their own psyches. Kylo needs to, to get himself under control and see that there is still light in him, Rey needs to come to an understanding of the Dark Side, rather than fearing and fleeing it. Rey might lean more Light, and Kylo more Dark, but one trying to kill the other is basically pointless. It eliminates the enemy you know, and the Force will produce a new unknown enemy to fill the void.
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Well, there's the thousand years or murdering anyone who labels themselves Sith, just for being Sith, regardless of what they do. The Masters going after Palpatine is just the latest iteration of that. Recall that being Sith just means they follow a different faith regarding the Force. It's literally an ongoing religious genocide.
There's also the pretty glaring lack of other Force users around.
Qui-gonn clearly states, when presenting Anakin to the Council, that "Had he been born in the Republic, we would have identified him early, and he would have become Jedi, no doubt...he has the way." That's not stating there was a choice there, or that there were other options. They usually took new younglings in as infants. They never had a choice in the matter.
Without the EU, we're short on full details, but there's certainly no evidence of non-Jedi force users, and the Jedi, by canon, grabbed all the kids born in the Republic who showed signs of being able to touch the Force.
It may be reading between the lines a bit, but it's not a particularly deep dive.