Drathnoxis said:
Okay, so reading the thread so far people seem to be bringing up 4 main points, but I'm not convinced that the narrative of the movie fully supports them.
1) Luke can train more Jedi
The reason Luke went into exile in the first place is that his initial attempt at starting his own Jedi academy was such a wash that he threw his hands up and went to live on a mountain. Expecting him to just start another Jedi school after that seems fanciful. Also, Jedi don't need teachers anymore according to the movie, since Rey doesn't have any problems teaching herself advanced Jedi abilities on the fly.
The stated reason he left was to go learn more about the Jedi, presumably so he could better teach people about the force.
Also, force users spontaneously learning force tricks in a moment of need is a long established part of the franchise, it literally happens in the first movie. After about 2 minutes of ben saying "use the force!" Luke is able to block lasers blind, and he somehow programs a pair of guided missiles using the force
better than a literal targeting computer could. In empire he uses the force to get his lightsaber even though Ben never indicates to him the force can be used in that way. Nothing Rey does is remarkable as a beginner force user.
2) Luke is a threat to the first order
Again, Luke is on a mountain. If he cared at all about the damage his fallen pupil is wreaking he probably wouldn't have waited 20-30 years before getting off his butt to do something about it. Even if Luke did oppose them, he's still just one man. The common argument against Rey being completely OP in the final confrontation with Ren was that he was shot with a bowcaster bolt, so obviously Jedi aren't immune to conventional weaponry. The Empire First Order could just give a hundred of their men bowcasters and tell them to go wild. Although, these are stormtroopers... Better make it a thousand, chances are somebody will land a hit.
As you are so fond of pointing out, Luke has been on a mountain in isolation for 20 years. How would he know the havoc his fallen pupil is wreaking? Maybe once he knows what is up he will get off his mountain and sort shit out.
Also, that combat situation only works if you get the chance to engage Luke in ideal circumstances, hence why it is so important to find him first so they can engage him in ideal circumstances, catching him off guard. Hell, don't mess with the bow casters, just shoot the planet his is sitting on with your planet killer. Or bomb him from orbit. Either way would work fine.
But if they don't get to engage Luke in an ideal situation then Luke is incredibly dangerous.
3) Luke is a symbol to the resistance
We never really saw that the resistance was really hurting for recruits or anything, it was never shown that there was any lack of morale amongst the forces. Even without Luke the resistance didn't have any problem pulling together to blow up the Death Planet in a sub-plot. So I don't see why there is any need for Luke as a symbol. In fact, I would say that the resistance already has a symbol: Poe. He's a charismatic, and ludicrously skilled pilot, who has now lead the assault that blew up the planet that blew up 5 planets. He's as big a hero as Luke ever was and he didn't even need magic powers to do it.
Why not two symbols? The amazing invincible space wizard veteran of the last war combined with the up and coming hot shot fighter pilot.
And no matter how good Poe is, Luke is galaxy famous. Even people living under rocks in the middle of nowhere (Rey) know exactly who he is. No matter how good Poe is he is not Luke Skywalker famous.
Also, yes it does show them hurting for recruits. The movie explicitly stated that now the new republic was destroyed the resistance completely lacked support, and even then, at what we can assume is the height of the resistances power (before that lack of support impacted their forces), they just barely manage to destroy the super weapon minutes before it fires. They could have used a lot more fire power and man power in that engagement, but since they were so short handed they had to make do with a plan that only works because of a fluke. The resistance is clearly out matched against the First Order.
4) Gotta kill the last Jedi
Someone pointed out that the bad guys haven't been called Sith, so if it's true that they aren't Sith I don't see why they should be interested in exterminating Jedi just for the heck of it. I mean, if there's a Jedi just sitting on a rock, the last thing you want to do is try and kill him, getting him angry so he'll come and thwart your ambiguous plans. Also, Jedi (and Sith) just seem to just pop up out of the woodwork --like Rey-- so hunting them down for the sake of it seems like playing a game of wack-a-mole.
Seems like an awful big risk to just hope Luke doesn't care that you are rebuilding the empire he dedicated his life to tearing down. As you are so keen to point out, he has been living in isolation for years, he almost certainly doesn't know about what is going on. Seems real unlikely that he is just going to continue sitting back once he knows what is up.