WD is a summoner yes, but different from Necro playstyle, philosophy. He is absolutly different idea of the summoner class and but still a summoner as Necro. If you want i'll use metaphora: they live on the same street but in different houses.
I am actually happy that the witch doctor is not the necromancer.I loved necro and I hope they will include them in some expantion or something.This way we will have 2 really great classes to play as ;P Imagine those 2 in arena as a team
Don't see Necro coming back in another addon. They will stick with the Diablo style and bring new classes. Witch doctor and Necro would have to much in common. Dogs - skeletons etc.. I would love to see two new classes as we saw in LoD. It's all about diversity.
I was always a big fan of the Necro in D2. That is what first drew me toward the WD originally. But as has been stated, there are enough disimilarities that I am not sure if the WD is the way I want to go to start. The summons are appealing, and I think the real challenge will be to synergize the spirit spells with the summon spells for control and damage.
I am sure that I will get to all 5 classes eventually, but I don't want to have buyer's regret on the first one.
Edit: Crap, didn't see that this was an old necro'd thread (pun, anyone?). Still interesting topic to me as I have only been reading the forums for a couple weeks.