I turned on IPv6 on my router two years ago and found that my PlayStation 4 did not support it. I promptly switched back to IPv4. Sony has not implemented IPv6 in the PS4 since, and my home Internet use has not suffered for it. I don't really have any incentive to switch, and while I'm aware there are hybrid solutions that might allow me to use IPv6 and still keep my PS4 online, I definitely don't have any incentive to go to that trouble.
And I'm a forward-thinking user who enjoys fiddling with my devices and trying things out! Imagine how it is for all the other people whose personal devices still don't support IPv6 and who have far less patience for this stuff.