Another (and possibly the largest) disadvantage is that this policy
does not address the transfer issue. By transfer issue, I mean the
ability of any RIR to change their policy regarding the transfer (and
overall distribution for that matter) of address resources at any
time. The primary reason that ARIN rejected the mandatory return
clause of prop-069 was this transfer issue and the need to uphold the
values expressed in RFC 2050 (namely needs-based resource allocation).
I understand that many likely see this omission as an advantage, I
simply wanted to point out that a good global policy in this area
probably needs to not only create a framework for re-allocation but
also facilitate returns, if it is to have any actual affect.