IMO, the sightlines are not the thing to be concerned about here, at least not yet. Yes, you’re losing specific vistas and the original feel of the space, and certain attractions like the Haunted Mansion may end up feeling more poorly sited; however, significant spend is going into making sure the entire area looks finished from all angles, even if you think it’s not as attractive, restful, or intentional-looking. When I think of sightline issues (particularly that impact guest perception of value), I think of the TRON box looming over Storybook Circus, the Cosmic Rewind box dominating the World Discovery skyline, or the poor backstage views of Ratatouille you witness on the skyliner.