Is League a Team-based Strategy Game?

Having a strategic backbone seems like it was the intent with 5-man teams, objectives, and a bunch of different champs. The game grew tremendously the first 5 seasons on the back of that foundation on which is was founded. But the last couple/few seasons have been a rapid decline which makes me think that the game is not the same. If it was the same it would most likely have the same great results? Going a different way would make it a lot more possible to have different results, which in the present case means a lot less players playing. And results do send a strong message of what gamers think.