There should be a long term planning to take care of the addl traffic expected. Some alternate routes, some re-routing of trains to avoid congestion, shifting of trains which are not used by the sections to odd hour slots, laying or linking of new lines/ existing parallel lines, etc. should be thought of.
I can provide some more long term plans, which may be thought of:
1. Linking of Chintamani to Madanapalli. Will reduce congestion between DMM to YNK/ KJM to JTJ. Freight trains can take this route.
2....
more... Linking of DBP to Dabaspet. Trains from JTJ side to TK side can use without even entering Bengaluru. Already state govt is putting up a 6/ 8 lane straight road between these 2 towns. New indl area is getting developed. Rly line run somewhat parallel to this major road.
3. Linking Bidadi to Anekal : Circular rail route to Bangalore can be thought of.
4. Provide a proper station at KG Airport area: No major investment is required. Just few buildings and posting of personnel. Run trains from YPR/ YNK/ KJM to airport every 30 min. Will reduce the road traffic to a great extent.
Some more in some other blog.