>>Ethereum's blockchain has a growth rate 2X bitcoin's. If it continues to grow at this pace, it'll eclipse 1 TB in size in 2018.

This statistic keeps being trotted out despite having been repeatedly shown to be extremely misleading:

https://www.reddit.com/r/ethereum/comments/7gcheo/the_ethere...

In short: the intermediate states do not need to be stored for full trustless validation. Ethereum nodes now prune intermediate states by default. Bitcoin nodes don't even have an option to store intermediate states. Intermediate state storage is an entirely optional feature and comparing Ethereum nodes that do it to Bitcoin nodes that don't is disingenuous.