In the latest news made by an Apple engineer named Ricky Mondello, the company will start to disable Adobe Flash by default. They will implement it on Safari 10 which will ship with macOS Sierra.
To ensure user’s experience remain intact, Safari will prompt a message for each website which requires Adobe Flash. The user can enable it for that particular time or allow it forever. On the hands, Apple is trying to teach you to live without Flash because it is cumbersome to update it regularly due to its vulnerabilities.