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How will IPv6 impact everyday users? (World IPv6 Day)

As I understand when we have finally made the switch to IPv6 not only will NAT be unnecessary but it is incompatible with IPv6?

Will that mean that ISPs will have to serve multiple IP addresses per customer? Will they provide a range of addresses for each customer or as each device connects will they get an IP address that isn't necessarily near that of the other devices in their house?

But overall will this be bad for the Internet users? as surely it will allow ISPs to see exactly how many devices are being used, and so allow them to charge for the use of additional IP addresses? And then if that happens, what happens when you try to connect an extra device to your network? Will it simply not get an IP address?
In my home we have about 15-20 devices connected at once, but for places where there are hundreds of devices, it seems like the perfect opportunity for ISPs to charge more?

I think I may have it completely wrong, so is there somewhere where there is an explanation of who things will work when IPv6 becomes the norm?