I understand the sentiment, but I won’t accept the latency penalty. ISPs shouldn’t be doing dynamic prefix assignments anyway because it breaks too much.
Depending on lots of things, it's easily possible that IPv6 via a he.net tunnel gets you better routing than via your carrier directly. I haven't tested, but my current ISP is stingy at peering, and HE.net is well connected on ipv6. They've got a tunnel endpoint at the large internet exchange in the big city near me and my ISP runs all of my traffic through there anyway. Of course, my ISP doesn't run native IPv6, so 6rd vs a configured tunnel is the same overhead; if there were native v6, you do save 20? bytes per packet, which can be significant.