Long term I have to agree with winkleburyctr: A website that has a v6-only address will never be reachable by a client that has a v4 address. Also not if that V4 address is nat’ted onto a v6 network, so repeated claims about it being a ISP responsibility may not be on the mark.

Short term I am not too worried yet, I suspect we will soon see v6-only consumer addresses, but hosting like web pages will probably be on a mixed v4/v6 address for a while longer. At this point it is more important that underlying software is developed (like peperspot), services like HotSpotSystem can lag behind a bit.