It is easy to get 10 but 500 or 1000 is very hard even in 2 years. I am sure they will make changes to this.
Nonsense. Look at Lutpin: he went from 500 to over 1000 in less than a day. Granted, he's an exceptional individual, but it proves that the path to Legendary status is not impossible.
And exactly why do you think he went from 500-1000 in less than a day?
Hint: It is not because he is hung like a moose.
It is because all people with less seniority merits the people with high seniority, and all the people with high seniority merits the people with high seniority. It is like a four-five star merit bukkakke.