Could it be possible to just change or replace the current Mesmerist NPC to be able to do a per character one-time-only stat and skill reset? It's basically the same overall idea with less hassle. I imagine there's no real easy way of knowing how many players have a bunch of items in their carts / on their person, and I'm pretty sure there will be problems for those characters if the forced reset goes on.
The only real "problem" I could see out of this would be people using a levelling build at first then switching to what they want afterwards, but I don't know, with all the resets we've had available and it still being the beginning of renewal, I think it'd be better than having a ton of problems arise from the forced reset.
I also think that this is a better solution. This way, old players coming back, can actually get a feel of Renewal with their current builds, before resetting it. Because seriously, an old player, coming back to RO Renewal, who has absolutely no idea how the new stats work, is bound to mess up his build. At least if he gets to feel around Renewal with his current build first. . .