You can request IPv6 addresses from a RIR, but that won't last forever either, and nobody will visit your site, not even the search engines. People wouldn't be

You can request IPv6 addresses from a RIR, but that won't last forever either, and nobody will visit your site, not even the search engines. People wouldn't be even able to open it for long, since most browsers are going to require SSL, and who knows what other changes are coming in the future that require a domain name.