Say you have 1 PVP Nightblade in AD but your friends have their best PVP toons in EP, on Live it is no problem, because you can play with your friends on one of your bad PVE EP toons for a hour or 2 and then when the map is red and they are bored they can go on AD and play and you can be on your favourite character.
In future, you either have to choose
1. A month of a toon you cant be bothered to PVP on
2. delete a toon and lose all his achievements and rank up a EP NB over a few weeks
3. Find a New PVP group
If you had a Faction Change Token (With a 30 Day Cooldown! to prevent exploits) people could correct decisions they made when they were new to the game and had not found Guilds/ Friends or a Favourite playstyle... also some people were around before "ONE TAMRIEL" and needed different Toons in different Factions for the full game play experience.
Since One Tamriel made it so you can do Any zone at Any time with a friend from Any Faction and battlegrounds lets you PVP with Friends from Any Faction is there really a point to fencing players into a Faction at this point.