Since Kierkegaard was totally forgotten and wasn't rediscovered made popular in Germany by Boltmann till the 20th Century and no English translation till the 1940's I really don't see the significance of your comment.
> How about 1/10?
Not sure what you are saying there
>It's a realistic view of a great study
90% of CS Journal Articles are garbage? 90% of Math in Journals are garbage? 90% of Medicine Writing Journals are Garbage?
It isn't acceptable to disparage a Philosophy and call it a waste of time. It's right up there with it being okay to say "I'm not good in math" in professional settings. Both remarks are totally acceptable to say but they really shouldn't
I don't know where you got this, but it is an exaggeration of the truth. And unless you think the same thing is just waiting to happen to all the other philosophers that surrounded him, doesn't change the fact that most philosophy is tossed aside for good reason.
And yes, the same can be said of many different fields.