My main incentive to switch to HA was indeed partially the increase of ranged poplulation but more than that, I really disliked in what melee has turned into. High agi shielders and rondel trolls make my melee experience... well let's just say I hate to see medieval Usain Bolts, I'm not the one to judge, they found their fun and I found mine in return. I'm having an awfull time on my polearmer alt no matter how much I try.
The thing that would make me really consider retiring and going full melee again would probably be buff to the plate armor. Don't even care about the price, I lose tons of gold on the HA I'd rather be paying for a Plate instead. Like Kafein said in the current state and the incentive to go light and fast, ranged indeed have a bigger impact on the battlefield. Before I couldn't see myself winning the rounds off a horseback as a HA, but nowdays I am able to pull it off on ocassion (rare but it still happens). From my experience so far as a HA I avoid melee in general especailly the tank guys because I deal little to no damage to them, but by the end of the round I'm forced to engage them too and killing them more with bumps than arrows really, light/mid guys I can kill. I remember once shooting atleast 10 arrows into Tyrannosurus, he wrote to me in chat: no damage. If that was the case (not to that extreme) I would probably tank myself and feel really discouraged to pewpew, but the recent patch made the game go in the opposite direction unfortunatley and I never see this happening.
Make a knight a knight again, make him what he was in Medieval times and I gurantee you many will switch to melee.