Hopefully that doesn't materialize.
In the past, when DHN-ALLP was diverted via Perambur, there were immediate protests from the passengers and the diversion was reverted.
Diversion of trains like Sanghamitra and DHN-ALLP will receive a strong backlash as these are the only direct trains to the respective destinations from Madras and they were also extended from Madras to SBC/ALLP.