I know many will disagree with me and that is fine, but cell phones will not drive adoption since they have to add plumbing for IPv4 regardless. The phone just has to route to the destination. Adoption will come when businesses are required to have IPv6 to make money, or conversely will lose money when they lack IPv6. I personally would exclude cell phones and VPS providers from numbers to get a real snapshot of meaningful adoption. Home ISP's and commercial businesses are probably more useful to see how far along IPv6 adoption is progressing.

In my opinion and experience when people are given a temporary work around such as ipv6toipv4 gateways, that work around becomes permanent and will stall adoption of the long term solutions.

Of course they have a choice: they could spent millions of dollars getting IPv4 address for their customers

Probably up to a point. They would have eventually hit a wall from port depletion as CG-NAT on gateways only scales so far. It works on home end-points because there are not typically tens of thousands of people at a home. It falls apart quickly when used on a gateway. Anyone that has managed many SNAT pools or a WAN optimizer in large companies has seen this first hand and can share their pain.