Admins already tried to create "bottleneck" before - it did not increase the interaction by far because most interactions with current server pop is when someone intentionally goes to the other player, therefore the number of systems does not matter.
Cutting the systems would only lead to reducing the world and RP for exploration which is some people do, It also will likely lead to reduction of buffer systems and increased drama for building pixel empires because it would be more difficult to do.