Re-gating the rep threshold for the close queue simultaneously reduces the credibility of the closing process. Members trust that a 3k user has been through enough to cast votes appropriately and fairly; and there are few, if any, members who can successfuly complain that a question was closed unfairly.
2k users are still getting their boots warm with having their edits applied immediately, and the community needs to see that this priv has bedded down first. As they can no longer gain rep by 2 point increments for editting, the climb to 3k is earned on the field of battle. In other words, it's a 1k of "pure" rep that only be achieved by contributing to the fundamental mission of the site. Also, the region between 2k and 10k would be unacceptably barren if the gate were changed.
But more worryingly, re-gating the close priv does not address the root issues surrounding how a close queue can reach 100k in the first instance. Is it changing demographics? A change in the topology of the user base? SO's positioning? If not, what has changed? I don't know what the underlying shifts have been and I doubt there is a glib answer.
So net-net, the proposal is well-intended, but not a solution.