Dual stacking with 64 (or more) bits and 32 bits would otherwise use the same software. It would be cheaper, require less training, and require less development

Dual stacking with 64 (or more) bits and 32 bits would otherwise use the same software. It would be cheaper, require less training, and require less development. It would therefore not face the old, established IPv6 problems covered in the article, and could even treat the old IPv4 ranges as a /32 within the 64 bit address space. Rather than being more than twice as expensive in terms of expertise and development, it would be nearly as cheap as doing nothing.