If you lose all ur guests (or most) then you can not afford to pay for them and that will make them more unhappy. you could use the expencive method (and u also have to wait till it is unlocked)
of replaceing the original fenceing with fences that can not be seen through. another option is delete everything other than the exhibit and its contents. If there is nothing there not evin a path, the guests will not be very attracted to that erea decreasing the amount of them. There is a downside to both of these optons. with the plan of makeing new fence, you hace to wait till it is unlocked and you have to pay alot of money. the downside of the delete plan is you made exhibits to show them off to guests, but they dont see it so there is no purpose of having it at the time besides the diverse speces thing, and u dont get money from shops there. I hope this helps u. by the way :welcomean to zoo admin.