If SR PGT is really interested, they would have developed MAJN. No train is starting from MAJN towards Kerala, so they felt no need to develop MAJN. If one Madras train and one TVC train is shifted to MAJN, they will think about it.
Here is where neglect of Mangalore by SR gets noticed. There is no place for daytime Bangalore train, but plenty available for 5 TVC, 4 MAS and one CBE train!!