Chris posted the reason for removing Eternal Orbs in the Development manifesto post here:
https://www.pathofexile.com/forum/view-thread/1302066
"
We introduced Eternal Orbs in the 0.11.0 patch two years ago. Since then, the impact they've had on Path of Exile and its economy hasn't been what we initially intended.
"
At the release of the next Path of Exile expansion after The Awakening, we'll review economic data and make a decision about whether they are restored or will continue to be disabled.
Please contact support@grindinggear.com if you need any assistance.
