While for short time IPv6 does not make sense but in Longer term, this reluctance might backfire because world will start adopting IPv6.there is no other way
I suggest not to wait that long, go ahead & start testing what your IPv6 readiness is. taking example Deployment story of heise.de, dual stack can be implemented without causing much problems.
A perfect day to do this will be June 8, 2011 which is World IPv6 Day, also known as "Test Drive Day".[1]