I voted Ban Steelixite and Don't Ban Heliolisk
Reasoning:
As someone who used this since it was introduced I would have been the first to say it has to go (I guess I wasn't :{). This thing basically makes fifty percent of the metagame useless and also functions as a nuke with stealth rock. Compared to something with a similar description like hariyama, Mega-Lix is somewhat more difficult to wall, has fairly decent utility in stealth rock/roar, gets even more impossible to wall under sand, and it just walls far more things than anything else in the tier. Not only that when it walls them it practically makes them useless to have even brought to the match.
Steelix can fit as a physical wall in most teams and does not require virtually any support. It becomes overly necessary to put mega lix in with your cores to make them function as highly as you want them to. It can fit in any play style against any play style except maybe against rain/sun.
At first I was with the crowds saying ban heliolisk (I also wanted viriz banned but I got over that). I started laddering with some teams where I didn't really prepare for viriz just to see what would happen. Honestly heliolisk may be hard to counter but in general it doesn't force nearly as many switches as people originally made it seem. I noticed in general it can get lethal results if the opponent predicts well enough but in general it was quite manageable.
Honestly I was on the fence about this mon... it worked amazingly in the meta and can volt switch out so many times. It has coverage making it nearly uncounterable and can just voltswitch out and get a better match-up. Logically I kind I am leaning towards ban for it but in practice I feel like it really isn't broken :/
I'm basically repeating earlier stuff here, but a Pokemon doesn't have to be broken to be banned. If it's just good enough to center the meta around itself, that's often enough cause for concern. Seriously, I really don't think Heliolisk belongs in NU.