You make some excellent points and I don't see anything unreasonable.
One potential issue that I see with divesting so much Steem is that anyone with a lot of money e.g. a bad actor or actors could buy a lot of it and we may end up in a worse situation?
We do need a plan and some certainty.
So the plan for divesting is urgent, but there is no need for the actual rate to be any faster than the time it takes to genuinely earn combined with a strategy for ensuring market stability. There are future steemians talents out there who need time to join in and earn some of the SP.