I think you'll be surprised. As soon as most large and medium businesses support IPv6 we'll start to see people dropping v4, likely within the next 5-10 years.

I think you'll be surprised. As soon as most large and medium businesses support IPv6 we'll start to see people dropping v4, likely within the next 5-10 years. When only a tiny % of your potential customer base is dependent on v4 you start to weight the cost of staying dual stack or just going pure v6