Lithuannian spearman and Roman legionaries have already crapped all over celt bonus. If any civs’s militia needs to play a proper role, its Dravidians because of their lack of options.
You don’t start with militia line in castle age. So the incentive to go milia as part of army comp comes down to utility in early, mid-game game as well. Dravidians should have the option to not go stable in feudal age against skirms being massed by opponent. If Man-at-arms have the speed to counter skirms at all stages of game, then Dravidian strategy can be based on them. Otherwise the unit will have no use for Dravidians too and useless overall. Its not like the unit will suddenly become unbeatable, knights do exist for other civs and mangonels do trade fairly well against them.
“Receive 10 wood for every villager trained” is a great bonus. If this is implemented, a civ bonus slot will be available to make militia line a better unit for Dravidians. The -33% damage gimmick belong to scicilians along with defensive buildings stuff. But the civ is still a one-trick pony. Dravidians can do better if they are able to use just barrack and range units agressively.
If devs feel the bonus will be broken on water and nomad, the dock bonus can be exchanged for something else like
If the civ has more problems with Siege in late castle and imp. There is always medical corps which can be reworked.
This kind of rework and new mechanism will probably not be looked upon favorably. It is simply too much work for a civ which is basically free now.
EAs are billed as repacement of Knights and CAs especially for Dravidians. Both units are very different and generic elephant archers don’t have the dps of knights or speed of cav archers. Thankfully Dravidian EAs have higher DPS with 25% faster firing. But a speed boost is needed to do cav archer job in castle age. Dravidian problem is the civ comes to a stand still against monk + siege pushes. The problem is unique and is not shared by Bengalis or Gujjaras. The speed boost will help Dravidian stategy to engange siege proactively by deploying elephant archers from existing ranges instead putting down a panic siege workshop. The downside of elephant archers is that your imp timing will be hit hard and the unit still dies to skirms. Hence the longswords.
If the bonus damage is reduced by even 1, the unit will still be functional. But I doubt it will fix Dravidians or change the gameplay considerably.