Keep the existing Green Belt…

Keep the existing Green Belt in place. Land farther afield would not replace the benefit to having actual green land close to the GTA.
More development closer to the GTA would further increase the congestion and be a negative impact on the area.
Look to the Toronto waterfront in the central area for a disaster to avoid. The wall of condos without green space is creating a mess of psychological challenges and in desperation residents are trying to find refuge on Toronto Island creating new traffic challenges. In short, more development close to the GTA means a lesser quality of life for everyone.