This is a naive statement since it assumes IPv6 support amongst the clients. At least here in the US, such support is fairly minuscule.
And it's more than double compared to a year ago [1].
While indeed this still qualifies as "relatively small", I think it grew out of the "miniscule" :-)
[1] http://6lab.cisco.com/stats/cible.php?country=US
My local ISP (small, independent) has no current IPV6 plans, which is actually a little bit annoying.