Ethereum might not have been the best choice, but there are ways they could migrate to another GNU Ring-specific blockchain (therefore a smaller blockchain; there are only so many people who are going to use Ring and they will only want to have so many separate identities) if the Ethereum blockchain really became unmanageably large.
Re:GNU Ring 1.0 released
by vertex-four on Friday July 28, 2017 @09:45AM
(#14874210)
Blockchains grow unmanageably large over time by definition, no matter how application-specific you make them, unfortunately. Ethereum isn't the problem - blockchains are.
In practice, even DNS-based aliases are a better idea, given the tradeoffs.