The real solution is to invest in building public transit infrastructure, to design cities to be walkable.
We are talking about Paris here. Paris has the best public transit infrastructure in the world. Paris is highly walkable.
People who drive downtown have no excuse for their actions and must be penalized accordingly.
When London implemented congestion pricing, it significantly improved traffic and encouraged people to take transit. You are completely ignoring reality if you oppose congestion pricing on the basis of it being ineffective.