There is a really good reason that WoL hasn't come back and why it's not going to. Folks will argue up and down that it isn't true, but I truly believe it to be the case - it's a combination of the "life" part being simply a difficult topic for a theme park and that "health" is such a fluid (and controversial at times - vegan vs. vegetarian vs. everyone else) space that unless you are ridiculously generic ("Eat your fruits and veggies to grow big and strong!") it just doesn't have much of a chance for educational impact. With the "life" part - I mean, "how a baby is made" was already getting dated when WoL opened - adoption, surrogates, artificial insemination, sex selection - I mean, it's just not a topic that a theme park attraction can cover.
There just isn't much of a "forward thinking Epcot" they could really do with it, either - unless they start talking about bionics, etc. and other topics that again - are pretty subjective (good or bad to genetically manipulate ourselves for example). And it would have to be constantly updated if it wasn't overly generic - I mean, we now know that the cholesterol in the food you eat has very little impact on your actual normalized cholesterol levels, yet that was considered solid scientific fact for decades.
It just was a bad idea to begin with, one that will never be resurrected. Again, I know that folks will vehemently disagree with me, likely with armchair imagineering. I could expand on the above points but I've really summed up the basics - the topic moves too fast and there is just such general disagreement on what in the end is a
highly personal topic. That's really what it boils down to - nothing is really more personal than your health and the choices you make. And with so much variety in how folks live their lives these days, it just would be very difficult to make anything that would be well-received and not be rendered meaningless by having to be so incredibly generic.
There are much better uses of that space - I expect someday the place will be razed and a new pavillion will go there, with a different theme. Personally, I always liked the Weather idea. And hey, folks make fun of the "Weatherman" - because we all should be known by the first jobs we held, of course, LOL - maybe they can dedicate it to Iger.