If you think that the IPv6 address space is infinite for all practical purposes, then think again.
References
Wolfgang Schäuble, former Minister of the Interior and current Minister of Finances, Germany.
Jon Postel, former Internet Assigned Numbers Authority (IANA), among other things.
RFC 3177: IAB/IESG Recommendations on IPv6 Address Allocations to Sites, the RFC that originally mandated /48 prefixes for end users.
RFC 6177: IPv6 Address Assignment to End Sites, successor of RFC 3177 which “legalized” the allocation of /56 to end users provided that they don’t actually need a /48.