Will the RR's respond accordingly, and monitor the status of their equipment more closely?

Not voluntarily for sure. The NTSB's main concern seem to be the continued use of DOT-111 type tank cars. The fire resulting from the derailment was started by the rupture of one of those cars.

From their recommendations:

Voluntary industry action to improve the safety of the tank car fleet by completing the phase out of remaining DOT-111 tank cars in flammable liquids service ahead of the Fixing America's Surface Transportation Act mandate is feasible, but such action is unlikely
because of economic and business disincentives.

...cost of derailments built into their fee schedule.

Probably not specifically but you can bet their insurance premiums are built in.