During the course of a meeting, I'm sure it was suggested that platinum could acquire some value again by tieing ED resets to the currency. And there is nothing particularly wrong with giving platinum value again. In theory, this would stimulate the auction economy. However, there are a few barriers in place that inhibit this - platinum spent on ED is "lost" in that it doesn't circulate back into the game and many (most) modern loot items are all BTA limiting products that can even be transacted.
How could this be addressed? An easy method would be to simply increase the platinum cap. The current cap has been in place for many years. Pushing it up a million wouldn't be out of line and would keep pace with inflation. I understand the reasoning behind a platinum cap - it prevents Eberron Amazon from being formed where a small number of players could acquire huge fortunes and then control the auction house. I don't think giving everyone a 20% boost to their cap would devolve into that. Another method would be to recognize that players will want to reset their EDs, perhaps quite often. Currently, players are allowed to donate platinum to their guild where it collects in a guild bank. Couldn't we have an ED bank for our characters where each of them could make deposits and then when one of them resets an ED they can take the funds out of that savings?
Having ED flexibility is something worth paying for so I understand the cost associated with it. In order to accommodate this design though, it would help out the player base if one of these methods were enacted. This would make changing EDs easier while still allowing for the cost and presumed design philosophy behind them.