Average people with zero technical knowledge could not start their own coordinator and even if they had the skills to do so, they would not keep their service open indefinitely if there was a lack of traffic.
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Right now we are delivering the coordinator as part of the Linux packages, which means that Linux users can start a new coordinator just by typing $ ./wcoordinator and pressing enter. In v2.7.0, I will expose it automatically as an onion service and make sure it detects and connects to the Bitcoin node, if any. The idea is to make it trivial for anyone to run a Wasabi coordinator.
We should not assume all coordinators will be public but rather the opposite. Even a company could run its own coordinator for its own use. Just imagine different company departments making payments to different providers or even paying themselves. They would prefer to pay in coinjoins to avoid revealing each department's budget to other departments and providers.
Imagine you receive donations. You don't want all your donors to know how much everybody else has given or how much they own, and you don't want to let donors know how much you are paying to whom. Having your own coordinator has many advantages over huge public coordinators.