Theoretical draft scenario:
Enemy picks Sonya
Ally team picks ana and Li Ming.
Enemy picks Tyrael and Tracer.
As the Ana is your game destined to be painful as you die instantly to dives and can’t do any macro? Or is there a way your team can counter draft?
Just a thought experiment, curious what people think.
Assumptions: no difference in player’s skill or premades.
Main tank Uther.
Name a map. I don’t see a name of it.
For ally team, I would go Diablo for the tank, as he has some strong point and click cc. Uther would also be a good pick, especially with divine storm.
I think a strong autoattacker would also do well here. Tracer gets absolutely smacked by AA damage since she can’t dodge it.
So I guess my final answer is Diablo (if map allows), Uther and Raynor(?)
And for the love of all that is holy, that Ming better go E build.
Uther tank was my first thought as well.
Map is left intentionally ambiguous. Uther/Ana on a map like BoE would probably do really well.
Diablo is actually not that good against a dedicated dive comp, mostly because everything he does is single target, and Tyrael negates a lot of his kit. Garrosh would be a better alternative, especially with his AoE taunt. He can throw the Ana to safety, toss away the divers temporarily, and has other mitigation tools that work well against dive.
Uther would still be the best bet. I love Uther double-support comps.
Diablo as a tank seems like a go to, but ETC also seems solid, his ability to stop dives and heavily punish those out of position is a great boon, also only Sonya can knock you out of mosh atm without ults.
Abathur can be jonnie on the spot with protection from ganks and dives, as well as set up good fall back points with mines.
The folly of dive comps is that they often leave their own back line open. Greymane can just as easily lay heavy damage into divers as well as dive in himself. Same with Imperius, to an extent, but he is more defensive.
Edit: How could I forget the Main Man, the King of Punishment, Garrosh. Ally throw and enemy throw with an AOE taunt is so much displacement and set up for ming. His self sustain doesn’t require as much babysitting from ana, and is a decent nano boost target in a pinch
I was also thinking Garrosh, but the lack of a gap closer was throwing me off. But if you wait for them then that’s a non-issue.
And about Diablo, good to know. I don’t do tanks really, and half of me posting this was for feedback on my drafting analysis
Diablo is really strong if they have a single diver, like a Tracer or Genji, but if they go all in on the dive, like a Tyrael or Medivh comp, he can struggle.
I was thinking about this idea because sometimes Hots feels like chess, where a few innocuous moves can almost spell doom from the beginning.
To continue the hypothetical, say the map is GoT. If your team picks up uther in response to tyrael/Sonya/tracer they can shift to a heavy macro style(since uther and ana suck at camps and waveclear). If you keep it solo support ana to have a strong macro then you’re still weak to dive.
You could still solve this with precise hero picks, probably, but it becomes a lot harder cause your whole team has to know how to draft and have the champ pool.
Also, I was thinking about this because whenever I pick ana feels like a dive comp always gets picked against me XD
In that case, I would draft jungle-build Blaze as the off-lane, as he can take and clear camps well, and a Blaze on the flank against a dive team is nasty. He has Bunker if the Ana is getting focused, and additional CC for peels. Raynor or Fenix might be good choices for the last pick.
Since they seem to be going low CC, ETC or Tychus could work, as well as Zeratul.
I like the idea of blaze pick, bunker could possibly save against tracer bombs. Blaze’s stun aoe would be great if the enemy clustered around the Ana. Blaze stun+divine storm could mean gg.
Thanks for the feedback, all, 
Yrel, Diablo/Varian and Raynor/Cassia.
I wanted to say something similar.
I also like the Uther suggestions here.
(Also both Tyrael’s and Sonya’s dive counterable by Ana’s Sleep dart.)