The QB position is changing, but you still have to be able to throw the ball with accuracy and efficiency. As long as people are more afraid of Lamar Jackson's legs than they are of his arm, it's not gonna get any better. It's gonna regress because people will catch up with the scheme.
And he's not going to always be able to outrun defenders. Vick became a more complete QB in his years after prison. His ability to play from the pocket allowed him to extend his playing years once he returned.
Jackson and their coaching staff are going to use what they have while they have it. Harbaugh even talked about how they tailored their offense to fit Jackson's skill set instead of the other way around. Now granted, the philosophy will only work for as long as Jackson is able to outrun defenders.