I don't think there has been a season without rumours that they're considering making use of the gardens again. Especially now they've got four of its 'landmarks' looking back to their best, at a fair cost, you'd think they'd want to show them off and try and get some of that money back.
I can't imagine adding any infrastructure to prevent 'garden only' guests getting into the rest of the park would anything other than a drop in the ocean in comparison to the money they've spent on restorations in this season alone.