If every single incentive structure rewards the Democrats for shifting to the right, please tell me how on earth they are under any pressure at all to shift back to the left. The answer is that they’re not, and the people who believe that they’re engaging in the system and pushing it in the right direction are simply fooling themselves as they take part in the system’s unstoppable rightward movement.
To push the Dems left you can either a) reward them for moving left or b) punish them for moving right. Continuing to vote for them year after year as they continually move to the right accomplishes neither of these things.