The original ending does make much more sense than Lindeloff's ending, but to have another zombie carnage/battle scene after Israel would indeed be just too much.
It looks like the whole script was a mess at any part of the filming, with both endings. The original script might've worked if the Israel part would've been scaled down significantly or even made the part where Brad Pitt discovers stuff about zombies, without major battle scenes. The new ending fits better what comes before it, but it doesn't make sense, so instead of enjoying the tense and pretty well filmed scenes, I was just thinking "Whaaaaat?" through the entire WHO part.