Hazrat Nizamuddin is already very crowded and if New Delhi trains are made to terminate then It will be difficult to handle trains from Hazrat Nizammudin . In my opinion:
1)Kota bound trains might short terminate at Faridabad, Okhla,or Tughlakabad,
2) Jhansi, Bhopal bound trains at Nizammudin
3) Rewari, Ambala bound Trains from Old Delhi
4)...
more... Kanpur,Moradabad bound trains from ANVT, GZB