Bingowings said:
The Jedi were meant to be like warrior monks from the East.
Orientalism ascribes the East with a magic cauldron of exotic human abilities (Yoga, martial arts, sorcery, immortality etc). The idea being that while the Tibetans, the Chinese, the Japanese etc were human beings like us. their culture contained disciplines we never developed or forgot.
It was a trope of 19th and early 20th Century fiction that a Westerner would visit some far flung school in the East and come home with exotic abilities.
So no it doesn't weaken the Jedi if anyone could learn their disciplines.
It strengthens Palpatine's desire to wipe their teachings and teachers out...all of them.
While I understand your angle, I really must disagree that making it so that any Tom, Dick, or Harry could have stepped up and been the next Luke Skywalker is a good thing.
If having the ability to be taught to use the Force is innate in all denizens of the galaxy, why wait for Luke to come of age? Why not train someone with obvious talents (like Han)? If the death of Vader and the Emperor was the ultimate goal, then someone who was emotionally disconnected from Vader would have been a better choice. In fact, why leave it up to one man? Why not train several well-chosen people to fight the Empire?
I also feel like comparing the Force to yoga or a martial art is pretty silly, honestly. The Force is a supernatural thing, which is not exactly the same as stretching a certain way, or even learning how to fight; and while the Force and these real-world practises do both have a few things in common, learning how to break a board is not quite the same as learning to use their mind to help block a blaster bolt with a blade made of energy, and I feel like making it so that just anyone off the street could be trained to telekinetically pull a starship out of a swamp like we can learn how to do a downward dog really devalues that amazing ability and the power of the scene that showcases it.