I like towers street!
The view as you enter the park is lovely! being greeted by the grass and the towers, and the froggies in the fountain! The music just makes it feel like your home with the staff taking photos and the park keepers wandering around. It just feels like the hub of the towers and really is magical! I would miss good old towers street if it went!
This is the major point going against an entrance relocation. You're just not going to get that iconic image entering the park through Forbidden Valley. The name of the park is Alton Towers and it is right that the Towers are the first thing you see as you walk into the park, just as you see the castle entering any Disney park.