Is Lol getting boring?

It's not for me. The only time you will get bored is either you have a rough day and you don't wanna play anymore or you don't find the satisfaction you're looking in a game. Me as player since 2013, I don't find it boring. The people who mostly got bored was a pro player who reaches the end of the line of the game which is the Challenger rank. Challenger usually takes 15 minutes just to queue and it didn't mention that most of them dodge due to the team comp they have. So in the end, it depends on your taste of GAME.