Without dismount people will just run forever, not to mention that it completely ruins every weapon in the game that has the special. Pvp zergs will just get bigger and make pvp even less fun. I rarely die after being dismounted cause I play with people who work together and heal. Dismount is not a gamechanger it just keeps fights real instead of one single fight lasting 10 hours til one side quits due to boredom.
That's why I say have a 10 minute timer - if the fight is dragging on, it can be ended then by a Dismount.
PvP zergs being bigger, is a good thing, it's more players/teams in PvP and Felucca, experiencing the best largescale flowing fights - by far the best pvp style out there.
Whilst pvp zergs are a good thing, especially if there are a few of them, being dismount ganked by them is not so cool. You do want the chance of flowing pvp.
You guys all seem to have forgotten how to kill without Dismounts - I feel sad when I listen to you all. You can trap players, you can sync, you can split them from their group, you can use actual skill and strategy.
When you have more players involved, it encourages lesser skilled players to take part, they can be part of it and have fun, pvp isn't just the premise of elite players who have honed everything down to perfection, and when there are more average players around, it just gets all more fun. Dismount ruins the feeling of fun, it's as simple as that, no-one wants to come back after being Dismount ganked. No-one wants to be a Duck in a shooting gallery, no honour, no fun, no dignity.