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How about increasing the amount of wards the totem gives after a set amount of time or after an objective has been completed? This would increase vision as the game progresses while remaining a whole team effort.
Let's start with what is the problem you are trying to solve with any change. We could increase wards as the game progresses, but what is motivating us to do so? Any change also comes with trade offs, and too much vision has its own problems.
If we felt vision in the late game was a problem, and something that needed to be increased then this could be a good option. However it's generally better for vision to decrease over time so that players don't have perfect situational awareness. An example of this is that losing a tower decreases vision.
This makes sure that plays still happen, and players can set up ambushes or take objectives.
