But what do you sacrifice to get it? The beauty of Runeglaive is the on-hit and jungle item in the same slot; for Eve it is very slot efficient. Eve never builds Luden's unless stupid ahead and building glass cannon (and even then, there are better choices for the Widowmaker). So now her jungle item becomes slot inefficient since the proc is not that great on her and she has to sacrifice another slot for Lich Bane (which might not even be worth it).
Regardless of how you slice it, Eve loses out on these changes. Runeglaive coupled with on-hit effect buff to her E brought Eve out of the gutter. This change very well might drop her right back into it.
I also think that Elise might be hurt by this as well. I just picked her up so I don't have much experience with her yet (haven't played her since she was last in the free rotation), but I do know she has good synergy with Runeglaive.
I'm really not sure who aside from Fiddlesticks really likes the new item. I feel like for most AP junglers this is trading a fairly poor choice for a slightly less poor choice. For Eve and Elise, it's trading a slot efficient item (with good early game power) for trash.
I honestly think they should either keep Runeglaive and the new item (just like AD has Warrior and Devourer), or keep Runeglaive and bring back Magus.