IPv6 and the IP4 Internet

I’m really excited about IPv6, but I’m a little concerned because in everything I have read about the subject no one seems to have thought about how to make the process of converting from IP4 to IPv6 a seamless one to the end user. Being a computer consultant, I don’t want to have a bunch of calls from clients that say they can’t get to this or that website anymore because that site made the switch and the client hadn’t. Anyone have any thoughts or ideas?