I dont thin this route has that issue, Because its mostly double line with less fright traffic when compared to vskp diverted line. Recently when i traveled to BZA i spoke to some railway man, they also told me that plans are going on to send trains via that route to skip bza junction which is adding minimum 10-15 new trains a year.
I feel they have to building another station at BZA east cabin for halting these trains, from there it can take diversion. Not only trains running from VSKP to...
more... SC...trains running from HWH to SC, BBS,PURI,VSKP trains towards SC,NGP,MMR can be diverted via this diversion...but not existing trains for new trains its a best option.
For connecting issues one can catch trains at WL for NGP,NDLS route....chennai route is only little difficult.
Any ways railways mostly introduce trains for that dedicated route purpose...so i feel its a welcome move to divert some new trains from BZA east cabin to kondapalli which saves a minimum of 1 hr journey time and load on bza.