Why? If all rating systems are driven to ground then what did we earn in exchange?
We need a rough idea of what's there, some photos of the place and food tell a lot of the story. And prices.
Maybe some 'editors choice' for the one's that stand out.
A 'guide book' made by a small, decent team is as legit as any public review system, probably more so.
20 reviewers x4 restos a day (most are little brasseries, don't need tons of time) is 80 / day, 800 in 10 days only.
It would only take maybe 4-5 people to do it ongoing, once most were established.
If some reviewer smashes a restaurant because the food is too spicy it makes it of no value.
More likely, something else useless to take its place.
Some time around the point when our society grew large and mobile enough that relying on personal experience and word of mouth wasn't enough, because a sufficient number of people ate in areas to which they wouldn't return any time soon.