Driving costs down.
The way to drive costs down is through reusability and a high launch cadence.
The high launch cadence means that the costs of the rocket development and the costs of the launch, landing, and test facilities can be spread over more launches. The problem for an "Ariane 7" is that they will be competing not only with the Falcon 9 but also New Glenn, Neutron, Terran R, reusable rockets from China and India, and ..... Starship. Now I'm not saying that there isn't a market for an Ariane 7, but unless someone wants to use it to deploy a massive satellite array like Starlink it will have trouble getting a high launch cadence.