XP is a terrible tiered reward for pvp games, not very motivating.
With this change I can guarantee you it will make the situation worse, if it doesn't flat out kills the pvp queues. eg you ll see the loosing teams going afk in order to speed up the end of the game and you can expect way more toxicity.
That aside, I really do think MMORPG players are masochists who hate having fun. Because we actually had a system in place giving a decent amount of xp and that was fun and drama free, and people had to complain and ask for something toxic.