Yea, make it more viable for all classes again, increase its hit chance at level 50, thats all it takes
Of course they should do so, was the most fun build for necro, and even not top of the class at the end, so no reason to nerf it like that at all.
Also, Mirinae gem got a function, i mean what other build is using this gem? Right noone, since its just not viable.
Blizzard also has to rework all the gems too, giving them a 3rd affix for example:
(Not undo the nerf AND boost Mirinae like this, only one thing!)
That would make Mirinae a lot more useful...and some Build may use it again.
A lot of gems have not been used that much so far, or not even at all, they do need a rework!