The problems in that case is that 16 platforms of New Delhi station will be of no use. I think NDLS can be a major terminus for premium trains like Rajdhani, Shatabdi, Duronto, Humsafar, Tejas, Garib Rath, AC SFs of all directions. Rest can be as you suggested. HOwever, it will leave popular trains like Tamil Nadu, Poorva etc to terminate at NZM, ANVT etc.