During Kargil the Indian army used 100-120 guns at a time in concert to demolish bunkers and demoralize the enemy. For recapturing Tiger hill area itself the Indian Army used 300 guns.
Now this was an extremely limited, and localized war in a relatively very small geographical area.
Imagine if we had to find a war all along the Himalays with pakistan and china joining hands. Even without pakistan if China was to hold positions along multiple locations our current number of guns will be nowhere enough. So far our procurement was done with primarily pakistan in mind.
With our new look at China and a possibility (however remote) of a two Front war our realistic needs far exceed our current inventory.
The constraint is budget for both guns and ammunitions required to feed such a large number of guns. But in the future that is what we would be looking at, of that I am certain.
In fact after Kargil there was a proposal for by a few young Turks in the IA to have a doctrine of a "Wall of Fire" using 10,000 pieces of Artillery.
...... again the real problem is "Budget". (which includes logistics)
Our current doctrine of "cold start" or "short quick war" also seeks to have massive fire power for a short duration. Quick moving Light weight Artillery guns would be the first to be considered.