For me, it will depend on the %increase of Ethereum transactions and addresses being created. This is a nice article to read https://media.consensys.net/ethereum-by-the-numbers-3520f44565a9 and this a nice project to follow https://aleth.io/ . Also, a number of projects and developer's contribution numbers are important as a healthy measure. In my opinion, the value is only going up, but let's see what will happen with Ethereum 2.0