I did kingmaker and +3 curses for ele weakness on hit--I have not looked to see if that would over cap or I'd be using enfeeble. It's an I win button. With a diadem and desecrate on a trigger, I have died less than any other build. The necro build has become one of my favorites I've played. Depending on the nerfs, I'll probably run it as my league starter.; it can kill shaper/elder with a tabula and stack IIQ for early league faring. Also, it's a damn zoom zoom build.
Unless they go crazy with the nerfs and nerf a bunch of utility/qol, summoner will probably be fine. If they nerf damage left and right that'll be fine, I'd say 95% of necro/summoner current power comes from all the qol over time they've added rather than numbers. Convocation is just so so much better than it was like last year and before, it's easy to cap accuracy without needing something retarded like abyss gloves(recently-ish) or a shield+necro aegis, you get quite a lot of minion movespeed directly and indirectly without having to use the shit gem, spectres scale so much better(although I could see a nerf directed at that), having an additional bar is great, making stuff agressive or defensive is just great and while it's on support the supports are good anyway and those neat new wands.
It's just a lot more fun and easy to play summoner and doesn't feel like a chore for a large part of it anymore, hell even early leveling isn't as bad anymore(still the worst part, but as soon as you hit that spectre and carrion golem level you start flying anyway so no big deal and I've yet to check skeletons melee splash leveling).
Like I'm fairly sure they can nerf damage by 30-40% and there will still be enough anyway so as long as they don't go nerfing shit like how many skeletons you spawn per cast, convocation cooldown or minions gaining charges or whatever other stupid idea they could get, it'll be ok.
If I had to say, I think they'll nerf spectres(probably 1 less from gem, so 1 until 15, 2 until 30, 3 at 31 or something like that), they'll nerf feeding frenzy general buff and put some/all of the nerf back onto the gem itself so it buffs the supported minion more, I think they might finally remove EE which honestly would have made a lot of sense already since they added elemental army, they'll nerf Convoking Wands droprate probably(not a big deal though they're pretty easy to craft), I could easily see Mistress go back to 50% yet again, and I assume they'll be nerfing Baron one way or another, either directly or the interaction with various other uniques like Geofri's chest, Shaper gloves and the helm you can put on your AG that gives like 3k more ES and shit like that. The baron guardian setup gets pretty retarded on EHP and unlike many other such defensive builds, it actually outputs several shapers per second.