I'm wondering about that too, although I feel they would have announced it or started the demolition process already if they planned to remove it. It looks like the main entrance to the land will be where the bridge is located in that aerial shot posted above. I'm guessing the hills here will hide that backstage tunnel.
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The only pathway leading to this area is a gate beside Sindbad. This area looks about as wide as the nearby pathways in Lost River Delta, so normal foot traffic shouldn't be an issue. However, it seems this area will be the only way in and out of Fantasy Springs. Unless they control the number of guests allowed in Fantasy Springs, I can see some major congestion in this area.