The only method we have is BGP-based multihoming, but it doesn't scale well with the number of participants and anyway requires experienced administrators to setup and maintain.
Compare this to IPv4 NAT - you just plug two WAN links into a router and it works. Transparently and immediately. No need to pay $3000 just for that privilege.
So until something like LISP is deployed widely, we have no chance but to live with NATs. Even in the IPv6 world.
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