IPv6 necessary? recommended? or don't bother?

The more I read about IPv6, the more I am convinced that it needs to be adopted.

ISP’s like Verizon, T-Mobile, Sprint all roll out IPv6 capability, with talks about getting rid of IPv4 to simplify their network and reduce cost.

Yes, most servers support IPv4, but to appease to the majority user, it is worth to consider that it will increase availability and usability by enabling IPv6. Otherwise, when these ISP’s make the FULL switch to IPv6, users that refuse to ignore the other facts as mentioned, will NOT be able to access their mail from their phones, which is a very useful function!