Thank you for echoing conventional wisdom. 
I would suggest that anyone with an opinion on this issue
[renumbering] obtain and read RFC-1900 ['Renumbering Needs Work'],
as well as RFC-1916 ['Enterprise Renumbering: Experience and
Information Solicitation'], before firing a salvo over the bow.
Renumbering may soon be a fact of life. The PIER [Procedures for
Internet/Enterprise Renumbering] IETF Working Group is currently
working on documenting renumbering issues to assist organizations
in operational aspects of renumbering.
Get involved, if this issue concerns you.
-paul