Well actually its not a long way to reach xForm, but i think in the long term, there will be the same problem as on retail, since ppl that take all gp you can get, can easily outrun the daily GP-loss. So they will finally hoard an Amount of GP that can never be contested any more.
I think a percentual GP loss is in general the only longterm-working system. I don't really like a day where GP are reduced by 30-60%. that has negative effect on playing behavior - when tomorrow all my GP are halfed - there is way less reason to go to raid. When day 30 is end of season - you have to keep arena tickets from day 23 to 30 so u can have more value of them when using on day 1. Or lets go further - collect 90 days glorytickets to use them after reset - and get a way higher rank than deserved. You will agree that such a "hard" day of reset is abusable.
A daily GP loss of 1% or 2% would have same effect without any abuses and is way smoother and fair for all.
1%loss/day means doing nothing you loose 26% in 30 days
2%loss/day means doing nothing you loose 45% in 30 days
In addition I would like to mention what GP are used for. GP have the function of distributing the morph Ranks - Morphs are in this game for purpose of siege. So there should probably be GP only given in Sieges. I can understand why you get GP in arena or dred as well since its pvp and GP are enough reward to bring the necessary traffic for those dreds/arenas. But I can't understand why PVE-Instances such like "Hyperion" or "Pashid" provide GP since killing them does not need any requirements that qualify for a morph in Raid.
Well the higer GP loss per day on this server is already nice and shows work untli lower general ranks on Asmo side. But the top ranks will still walk away and will never be contestable with flat GP losses, what means they can hold such a rank for quite long time once deciding they dont wanna raid anymore.