Don't think ES can quickly bounce back from hits after the changes to vaal pact altho the new Ghost Reaver and ES leech stuff might let you do it quite well for self cast/attack builds. Less well with dot based builds, though, unless dot will be able to leech now.
Gotta agree with Kiroy, ES is back to being massively better than life in every sense now. I was fine with the re-bump to ES totals since life was still good for a lot of the builds I like (slayer + vaal pact heavy leeching builds) but now with leech nerfs and the reintegration of ES leech and ES numbers continuing to get bigger, whats the point in going for 6k life when I can have 11k ES instead.