Idea for XP for level 85

So once level 85 is reach XP doesn't matter anymore so I was thinking when level 85 is reach continue to gain XP to gain prestige. Prestige would be gain when a player would have enough XP to gain a level normally. At that point you would get an option on what you could get as a reward weather it be credits, gear, shards, crystals. Or instead you could get a new currency exclusive to level 85 that you get when you prestige and you would use this currency kinda like the shard shop or get a character shards that is only found with this currency