I like your points, but I would like to address some of them
yes, people who did not understand basic math and what is happening would be upset initially, however, once they saw and understood that the wealth gap didn't change rich were still rich and poor were still poor this upset would quickly subside into joy that the game could be played as intended again and paying 1,000 plat for a krono for example would be expensive again. Of course, to make that a reality it would take the removal of 99% of the plat or more....
I think they would also be very wise to phase out the krono because it opens a whole can of worms that an exploit on one server in one game is now an exploit on every server in every game company wide. So, it would be good to stop selling Krono and when the ones that currently exist are used up, they are gone; or at least restrict them to the game/server they are purchased for rather than account wide any game any server company wide. there have been several good ideas in these forums to address this problem.
as far as legal matters, No, customers would not be able to sue DBG because it clearly states that in game items and stuff that you're spending real world money on have no real-world value, thus preventing a lawsuit.
I have stated in other forums that the marketplace in general is a double-edged sword for EQ2, on one hand it probably saved the game, and the game is definitely more profitable because of it, on the other hand gameplay in general has suffered because of it. I would like to see the marketplace go back to fluff only stuff and especially get rid of P2W stuff. This was the "slippery slope" we warned about when the marketplace was first introduced. We were assured that this would never happen and well...... here we are.